1,721,058 research outputs found
Comment On "consistent Interpretation Of The Low-temperature Magnetotransport In Graphite Using The Slonczewski-weiss-mcclure 3d Band-structure Calculations"
Full text linkA Comment on the Letter by J.M. Schneider et al., Phys. Rev. Lett. 102, 166403 (2009)PRLTAO0031-900710.1103/PhysRevLett.102.166403. The authors of the Letter offer a Reply. © 2010 The American Physical Society.10411Luk'Yanchuk, I.A., Kopelevich, Y., (2004) Phys. Rev. Lett., 93, p. 166402. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.166402Luk'Yanchuk, I.A., Kopelevich, Y., (2006) Phys. Rev. Lett., 97, p. 256801. , PRLTAO 0031-9007 10.1103/PhysRevLett.97.256801Schneider, J.M., Orlita, M., Potemski, M., Maude, D.K., (2009) Phys. Rev. Lett., 102, p. 166403. , PRLTAO 0031-9007 10.1103/PhysRevLett.102.166403Smrčka, L., Goncharuk, N.A., (2009) Phys. Rev. B, 80, p. 073403. , PRBMDO 1098-0121 10.1103/PhysRevB.80.073403Sugihara, K., Ono, S., (1966) J. Phys. Soc. Jpn., 21, p. 631. , JUPSAU 0031-9015 10.1143/JPSJ.21.63
Graph Ene Physics In Graphite
No full textSingle layers of carbon dubbed "graphene", from which graphite is built, have attracted broad interest in the scientific community because of recent exciting experimental results. Graphene is interesting from a fundamental research perspective, as well as for potential technological applications. Here, we provide a brief overview of recent developments in this field, focusing especially on the electronic properties of graphite. Experimental evidence indicates that high-quality graphite is a multi-layer system with nearly decoupled 2D graphene planes. Based on experimental observations, we anticipate that thin graphite samples and not single layers will be the most promising candidates for graphene-based electronics. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.192445594563Kroto, H.W., Heath, J.R., O'Brien, S.C., Curl, R.F., Smalley, R.E., (1985) Nature, 318, p. 162Iijima, S., (1991) Nature, 354, p. 56Kopelevich, Y., Lemanov, V., Moehlecke, S., Torres, J.H.S., (1999) Phys. Solid State, 41, p. 1959Kempa, H., Kopelevich, Y., Mrowka, F., Setzer, A., Torres, J.H.S., Höhne, R., Esquinazi, P., (2000) Solid State Commun, 115, p. 539Kopelevich, Y., Torres, J.H.S., da Silva, R.R., Mrowka, F., Kempa, H., Esquinazi, P., (2003) Phys. Rev. Lett, 90, pp. 156-402Ocaña, R., Esquinazi, P., Kempa, H., Torres, J.H.S., Kopelevich, Y., (2003) Phys. Rev. B: Condens. Matter, 65, pp. 165-408Kopelevich, Y., Esquinazi, P., Torres, J.H.S., da Silva, R.R., Kempa, H., (2003) Advances in Solid State Physics, p. 207. , Ed: B. Kramer, Springer, BerlinLuk'yanchuk, I.A., Kopelevich, Y., (2004) Phys. Rev. Lett, 93, p. 166402Zhou, S.Y., Gweon, G.-H., Graf, J., Fedorov, A.V., Spataru, C.D., Diehl, R.D., Kopelevich, Y., Lanzara, A., (2006) Nat. Phys, 2, p. 595Li, G., Andrei, E.Y., (2007) Nat. Phys, 3, p. 623Dujardin, E., Thio, T., Lezec, H., Ebbesen, T.W., (2001) Appl. Phys. Lett, 79, p. 2474Novoselov, K.S., Geim, A.K., Morozov, S.V., Dubonos, S.V., Zhang, Y., Jiang, D., (2004) Science, 306, p. 666Novoselov, K.S., Geim, A.K., Morozov, S.V., Dubonos, S.V., Zhang, Y., Jiang, D., (2005) Nature, 455, p. 197Zhang, Y., Tan, Y.-W., Störmer, H., Kim, P., (2005) Nature, 455, p. 201Bunch, J.S., Yaish, Y., Brink, M., Bolotin, K., McEuen, P.L., (2005) Nano Lett, 5, p. 287Bunch, J.S., van der Zande, A.M., Verbridge, S.S., Frank, I.W., Tanenbaum, D.M., Parpia, J.M., Craighead, H.G., McEuen, P.L., (2007) Science, 315, p. 490Heersche, H.B., Jarillo-Herrero, P., Oostinga, J.B., Vandersypen, L.M.K., Morpurgo, A.F., (2007) Nature, 446, p. 56Novoselov, K.S., Jiang, Z., Zhang, Y., Morozov, S.V., Störmer, H.L., Zeitler, U., Maan, J.C., Geim, A.K., (2007) Science, 315, p. 1379Kelly, B.T., (1981) Physics of Graphite, , Applied Science, LondonGonzalez, J., Guinea, F., Vozmediano, M.A.H., (1996) Phys. Rev. Lett, 77, p. 3589Hearing, R.R., Wallace, P.R., (1957) J. Phys. Chem. Solids, 3, p. 253Zacharia, R., Ulbricht, H., Hertel, T., (2004) Phys. Rev. B: Condens. Matter, 69, pp. 155-406Kempa, H., Semmelhack, H.C., Esquinazi, P., Kopelevich, Y., (2003) Solid State Commun, 125, p. 1Luk'yanchuk, I.A., Kopelevich, Y., (2006) Phys. Rev. Lett, 97, pp. 256-801Kempa, H., Esquinazi, P., Kopelevich, Y., (2006) Solid State Commun, 138, p. 118Hannahs, S.T., Brooks, J.S., Kang, W., Chiang, L.Y., Chaikin, P.M., (1988) Phys. Rev. Lett, 1989, p. 65Eisenstein, J.P., Boebinger, G.S., Pfeiffer, L.N., West, K.W., He, S., (1992) Phys. Rev. Lett, 65, p. 1383McCann, E., Fal'ko, V.I., (2006) Phys. Rev. Lett, 96, pp. 086-805Novoselov, K.S., McCann, E., Morozov, S.V., Fal'ko, V.I., Katsnelson, M.I., Zeitler, U., Jiang, D., Geim, A.K., (2006) Nat. Phys, 2, p. 177Bernevig, B.A., Hughes, T.L., Raghu, S., Arovas, D.P., (2007) Phys. Rev. Lett, 99, p. 146804Matsui, T., Kambara, H., Niimi, Y., Tagami, K., Tsukada, M., Fukuyama, H., (2005) Phys. Rev. Lett, 94, p. 226403Niimi, Y., Kambara, H., Matsui, T., Yoshioka, D., Fukuyama, H., (2006) Phys. Rev. Lett, 97, p. 236804Berger, C., Song, Z., Li, X., Wu, X., Brown, N., Naud, C., Mayou, D., de Heer, W.A., (2006) Science, 312, p. 1191Sadowski, M.L., Martinez, G., Potemski, M., Berger, C., de Heer, W.A., (2006) Phys. Rev. Lett, 97, pp. 266-405Guinea, F., Neto, A., Peres, N., (2006) Phys. Rev. B: Condens. Matter, 73, pp. 245-426Visscher, P.B., Falicov, L.M., (1971) Phys. Rev. B: Condens. Matter, 3, p. 2541Hoinkes, H., (1980) Rev. Mod. Phys, 52, p. 933N. García, W. E. Carlos, M. W. Cole, V. Celli, Phys. Rev. B: Condens. Marter 1980, 21, 1636Zhang, Y., Small, J.P., Pontius, W.V., Kim, P., (2005) Appl. Phys. Lett, 56, pp. 073-104González, J.C., Muñoz, M., García, N., Barzola-Quiquia, J., Sppoddig, D., Schindler, K., Esquinazi, P., (2007) Phys. Rev. Lett, , in pressTombros, N., Jozsa, C., Popinciuc, M., Jonkman, H.T., van Wees, B.J., (2001) Nature, 48, p. 511Kopelevich, Y., Esquinazi, P., (2007) J. Low Temp. Phys, 746, p. 629. , and references therei
Ferromagnetic And Superconducting Instabilities In Graphite
No full textThis chapter outlines the ferromagnetic and superconducting instabilities in graphite. A structural disorder, topological defects, or adsorbed foreign atoms can be responsible for the occurrence of both ferromagnetic and superconducting patches in graphitic structures. It is suggested that the ferromagnetism in microporous carbon and nominal rh-C60 samples has a common origin, possibly associated with fullerene-like fragments. There exists both experimental and theoretical evidence that fullerene-like fragments, with positive and/or negative curvature, should be a common feature of microporous carbons. Such fragments should naturally appear in rh-C6o samples with partially destroyed C6o molecules. It is found that an adsorption followed by a desorption of oxygen gas at the graphite surface is responsible for the appearance and vanishing of the ferromagnetism, respectively. It is observed that as the applied field increases, the normal state orbital diamagnetism of graphite overcomes the paramagnetic contribution to the magnetization resulting in a negative total magnetization. The results indicate that the superconducting state is highly anisotropic and is associated with the graphite planes. © 2006 Elsevier B.V. All rights reserved.417436Kopelevich, Y., Lemanov, V.V., Moehlecke, S., Torres, J.H.S., (1999) Physics of the Solid State, 41, p. 1959Kopelevich, Y., Lemanov, V.V., Moehlecke, S., Torres, J.H.S., (1999) Fizika Tverd. Tela, 41, p. 2135Kopelevich, Y., Esquinazi, P., Torres, J.H.S., Moehlecke, S., (2000) J. Low Temp. Phys., 119, p. 691Kopelevich, Y., Esquinazi, P., Torres, H.S., da Silva, R.R., Kempa, H., Mrowka, F., Ocaña, R., (2003) Studies of High-Tc Superconductors, 45, p. 59. , Nova Sci Pub., N.Y. A.V. Narlikar (Ed.)Kopelevich, Y., Esquinazi, P., Torres, J.H.S., da Silva, R.R., Kempa, H., (2003) Advances in Solid State Physics, 43, p. 207Makarova, T.L., Sundqvist, B., Höhne, R., Esquinazi, P., Kopelevich, Y., Scharff, P., Davydov, V.A., Rakhmanina, A.V., (2001) Nature, 413, p. 716Wood, R.A., Lewis, M.H., Lees, M.R., Bennington, S.M., Cain, M.G., Kitamura, N., (2002) J. Phys.: Condens. Matter, 14, pp. L385Narozhnyi, V.N., Müller, K.-H., Eckert, D., Teresiak, A., Dunsch, L., Davydov, V.A., Kashevarova, L.S., Rakhmanina, A.V., (2003) Physica B, 329, p. 1217Coey, J.M.D., Venkatesan, M., Fitzgerald, C.B., Douvalis, A.P., Sanders, I.S., (2002) Nature, 420, p. 156Wang, X., Liu, Z.X., Zhang, Y.L., Li, F.Y., Lin, C.Q., (2002) J. Phys.: Condens. Matter., 14, p. 10265Kopelevich, Y., da Silva, R.R., Torres, J.H.S., Penicaud, A., Kyotani, T., (2003) Phys. Rev. B, 68, p. 092408da Silva, R.R., Torres, J.H.S., Kopelevich, Y., (2001) Phys. Rev. Lett., 87, p. 147001Yang, N.P., Wen, H.H., Zhao, Z.W., Li, S.L., (2001) Chin. Phys. Lett., 18, p. 2001Moehlecke, S., Ho, P.-C., Maple, M.B., (2002) Phil. Mag. B, 82, p. 1335Moehlecke, S., Kopelevich, Y., Maple, M.B., (2004) Phys. Rev. B, 69, p. 134519Esquinazi, P., Spemann, D., Höhne, R., Setzer, A.A., Han, K.-H., Butz, T., (2003) Phys. Rev. Lett, 91, p. 227201González, J., Guinea, F., Vozmediano, M.A.H., (2001) Phys. Rev. B, 63, p. 134421Ma, Z.X., Kyotani, T., Liu, Z., Terasaki, O., Tomita, A., (2001) Chem. Mater., 13, p. 4413Ma, Z., Kyotani, T., Tomita, A., (2002) Carbon, 40, p. 2367Boukhvalov, D.W., Karimov, P.F., Kurmaev, E.Z., Hamilton, T., Moewes, A., Finkelstein, L.D., Katsnelson, M.I., Neumann, M., (2004) Phys. Rev. B, 69, p. 115425Harris, P.J.F., Burian, A., Duber, S., (2000) Phil. Mag. Lett., 80, p. 381Blank, V.D., Buga, S.G., Dubitsky, G.A., Serebryanaya, N.R., Popov, M., Sundqvist, B., (1998) Carbon, 36, p. 319Murakami, Y., Suematsu, H., (1996) Pure Appl. Chem., 68, p. 1463Makarova, T.L., Han, K.-H., Esquinazi, P., da Silva, R.R., Kopelevich, Y., Zakharova, I.B., Sundqvist, B., (2003) Carbon, 41, p. 1575Lee, S.M., Lee, Y.H., Hwang, Y.G., Hahn, J.R., Kang, H., (1999) Phys. Rev. Lett., 82, p. 217Collins, P.G., Bradley, K., Ishigami, M., Zettl, A., (2000) Science, 287, p. 1801Jhi, S.-H., Louie, S.G., Cohen, M.L., (2000) Phys. Rev. Lett., 85, p. 1710Kabanov, V.V., Zavaritsky, V.N., Alexandrov, A.S., (2004) J. Supercond., 17, p. 113Kopelevich, Y., da Silva, R., Torres, J.H.S., Moehlecke, S., Maple, M.B., (2004) Physica C, 408-410, p. 77Esquinazi, P., Setzer, A., Höhne, R., Semmelhack, C., Kopelevich, Y., Spemann, D., Butz, T., Lösche, M., (2002) Phys. Rev. B, 65, p. 241101Céspedes, O., Ferreira, M.S., Santivo, S., Kociak, M., Coey, J.M.D., (2004) J. Phys.: Condens. Matter., 16, pp. L155Mertins, H.-C., Valencia, S., Gudat, W., Oppeneer, P.M., Zaharko, O., Grimmer, H., (2004) Europhys. 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Magnetization Measurement Of A Possible High-temperature Superconducting State In Amorphous Carbon Doped With Sulfur
No full textMagnetization M (T,H) measurements performed on thoroughly characterized commercial amorphous carbon powder doped with sulfur (AC-S), revealed the occurrence of an inhomogeneous superconductivity (SC) below Tc =38 K. The constructed magnetic field-temperature (H-T) phase diagram resembles that of type-II superconductors. However, AC-S demonstrates a number of anomalies, such as: (1) a nonmonotonic behavior of the lower critical-field Hc1 (T); (2) a pronounced positive curvature of the apparent upper critical-field boundary Hc2 (T); and (3) a spontaneous ferromagneticlike magnetization M0 coexisting with SC. Based on the analysis of experimental results we propose a nonstandard SC state in AC-S. © 2009 The American Physical Society.7923Black-Schaffer, A.M., Doniach, S., (2007) Phys. Rev. B, 75, p. 134512. , 10.1103/PhysRevB.75.134512Uchoa, B., Castro Neto, A.H., (2007) Phys. Rev. Lett., 98, p. 146801. , 10.1103/PhysRevLett.98.146801Honerkamp, C., (2008) Phys. Rev. Lett., 100, p. 146404. , 10.1103/PhysRevLett.100.146404Kopnin, N.B., Sonin, E.B., (2008) Phys. Rev. Lett., 100, p. 246808. , 10.1103/PhysRevLett.100.246808Sasaki, K.-I., (2007) J. Phys. Soc. Jpn., 76, p. 033702. , 10.1143/JPSJ.76.033702Ghaemi, P., Wilczek, F., arXiv:0709.2626 (unpublished)Khveshchenko, D.V., (2009) J. Phys.: Condens. Matter, 21, p. 075303. , 10.1088/0953-8984/21/7/075303Pathak, S., Shenoy, V.B., Baskaran, G., arXiv:0809.0244 (unpublished)Panigrahi, P., Vyas, V., Shreecharan, T., arXiv:0901.1034 (unpublished)Geim, A.K., MacDonald, A.H., (2007) Phys. Today, 60 (8), p. 35. , 10.1063/1.2774096Kopelevich, Y., Esquinazi, P., (2007) Adv. Mater., 19, p. 4559. , 10.1002/adma.200702051Castro Neto, A.H., (2009) Rev. Mod. Phys., 81, p. 109. , 10.1103/RevModPhys.81.109Hebard, A.F., (1991) Nature (London), 350, p. 600. , 10.1038/350600a0Tanigaki, K., (1991) Nature (London), 352, p. 222. , 10.1038/352222a0Da Silva, R.R., Torres, J.H.S., Kopelevich, Y., (2001) Phys. Rev. Lett., 87, p. 147001. , 10.1103/PhysRevLett.87.147001Hai-Peng, Y., (2001) Chin. Phys. Lett., 18, p. 1648. , 10.1088/0256-307X/18/12/332Moehlecke, S., Kopelevich, Y., Maple, M.B., (2004) Phys. Rev. B, 69, p. 134519. , 10.1103/PhysRevB.69.134519Weller, T.E., (2005) Nat. Phys., 1, p. 39. , 10.1038/nphys0010Emery, N., (2005) Phys. Rev. Lett., 95, p. 087003. , 10.1103/PhysRevLett.95.087003Ekimov, E.A., (2004) Nature (London), 428, p. 542. , 10.1038/nature02449Ortolani, M., (2006) Phys. Rev. Lett., 97, p. 097002. , 10.1103/PhysRevLett.97.097002Tang, Z.K., (2001) Science, 292, p. 2462. , 10.1126/science.1060470Takesue, I., (2006) Phys. Rev. Lett., 96, p. 057001. , 10.1103/PhysRevLett.96.057001Anderson, P.W., (1987) Science, 235, p. 1196. , 10.1126/science.235.4793.1196Gonzalez, J., Guinea, F., Vozmediano, M.A.H., (2001) Phys. Rev. B, 63, p. 134421. , 10.1103/PhysRevB.63.134421Samokhin, K.V., (2002) Phys. Rev. B, 66, p. 212509. , 10.1103/PhysRevB.66.212509Kopelevich, Y., Esquinazi, P., (2007) J. Low Temp. Phys., 146, p. 629. , 10.1007/s10909-006-9286-5Ivanov, D.A., (2001) Phys. Rev. Lett., 86, p. 268. , 10.1103/PhysRevLett.86.268Harris, P.J.F., Burian, A., Duber, S., (2000) Philos. Mag. Lett., 80, p. 381. , 10.1080/095008300403512Shibayama, Y., Sato, H., Enoki, T., Endo, M., (2000) Phys. Rev. Lett., 84, p. 1744. , 10.1103/PhysRevLett.84.1744Deutscher, G., Entin-Wohlman, O., Shapira, Y., (1980) Phys. Rev. B, 22, p. 4264. , 10.1103/PhysRevB.22.4264Zavaritsky, V.N., Kabanov, V.V., Alexandrov, A.S., (2002) Europhys. Lett., 60, p. 127. , 10.1209/epl/i2002-00329-2Blatter, G., Ivlev, B.I., (1994) Phys. Rev. B, 50, p. 10272. , 10.1103/PhysRevB.50.10272Li, Q., Toner, J., Belitz, D., (2007) Phys. Rev. Lett., 98, p. 187002. , 10.1103/PhysRevLett.98.187002Knigavko, A., Rosenstein, B., (1999) Phys. Rev. Lett., 82, p. 1261. , 10.1103/PhysRevLett.82.126
Dirac Fermions In Graphite: The State Of Art
No full textMacroscopic concentration of massless charge carriers with linear conic spectrum-Dirac Fermions (DF)-was shown in 2004 to exist in highly oriented pyrolytic graphite (HOPG) and governs its electronic properties. These carriers can have the same nature as DF observed in graphite monolayer (graphene) and let to view HOPG as superposition of 2D carbon layers, almost independent electronically. We overview here the recent experimental evidences of 2D DF in graphite and their similarity with carriers in graphene. © 2008 Elsevier B.V. All rights reserved.4043-4404406Novoselov, K.S., Geim, A.K., Morozov, S.V., (2005) Nature (London), 438, p. 197Zhang, Y., Tan, Y.-W., Stormer, H.L., Kim, P., (2005) Nature (London), 438, p. 201Brandt, N.B., Chudinov, S.M., Ponomarev, Ya.G., (1988) Semimetals I. Graphite and its Compounds, , AmsterdamKelly, B.T., (1981) Physics of Graphite, , Applied Science Publishers, London, New Jersey, and refs. thereinPartoens, B., Peeters, F.M., (2007) Phys. Rev. B, 75, p. 193402Slonczewski, J.C., Weiss, P.R., (1958) Phys. Rev., 109, p. 272McClure, J.W., (1960) Phys. Rev., 119, p. 606Luk'yanchuk, I.A., Kopelevich, Y., (2004) Phys. Rev. Lett., 93, p. 166402Mikitik, G.P., Sharlai, Yu.V., (1999) Phys. Rev. Lett., 82, p. 2147Mikitik, G.P., Sharlai, Y.V., (2006) Phys. Rev. B, 73, p. 235112Li, G., Andrei, E.Y., (2007) Natur. Phys., 3, p. 623Orlita, M., Faugeras, C., Martinez, G., (2008) Phys. Rev. Lett., 100, p. 136403. , (Preprint, arXiv:0805.0553)Sadowski, M.L., Martinez, G., Potemski, M., (2006) Phys. Rev. Lett., 97, p. 266405Jiang, Z., Henriksen, E.A., Tung, L.C., (2007) Phys. Rev. Lett., 98, p. 197403Zhou, S.Y., Gweon, G.-H., Lanzara, A., (2006) Ann. Physics, 321, p. 1730Zhou, S.Y., Gweon, G.-H., Graf, J., (2006) Natur. Phys., 2, p. 595Kopelevich, Y., Torres, J.H.S., da Silva, R.R., (2003) Phys. Rev. Lett., 90, p. 156402Luk'yanchuk, I.A., Kopelevich, Y., (2006) Phys. Rev. Lett., 97, p. 256801Novoselov, K.S., McCann, E., Morozov, S.V., (2006) Natur. Phys., 2, p. 177Gusynin, V.P., Sharapov, S.G., (2005) Phys. Rev. Lett., 95, p. 146801Peres, N.M.R., Guinea, F., Castro Neto, A.H., (2006) Phys. Rev. B, 73, p. 125411McCann, E., Fal'ko, V.I., (2006) Phys. Rev. Lett., 96, p. 086805Kopelevich, Y., Esquinazi, P., (2007) Adv. Materials, 19, p. 4559Novoselov, K.S., Geim, A.K., Morozov, S.V., (2004) Science, 306, p. 666Thomsen, C., Reich, S., (2000) Phys. Rev. Lett., 85, p. 5214Ferrari, A.C., Meyer, J.C., Scardaci, V., (2006) Phys. Rev. Lett., 97, p. 18740
High-temperature Superconductivity In Graphite-sulfur Composites: Theoretical Analysis
No full textRecently superconductivity in graphite-sulfur composites was experimentally observed. In this work we have analyzed the electronic structure changes associated with the presence of sulfur atoms in one and two dimensional graphite layers. We have considered ordered and disordered sulfur atoms distributions in many configurations. The density of states (DOS) of these structures were obtained using the negative factor counting (NFC) technique coupled to a tight-binding Hamiltonian (Hückel type). Our results indicate that the incorporation of sulfur atoms at edge graphite layers (changing their global geometric curvature and increasing the DOS at the Fermi level) might be in the origin of the graphite superconductivity.689127132Da Silva, R.R., Tores, J.H.S., Kopelevich, Y., (2001) Phys. Rev. Lett., 87, pp. 147001-147011González, J., Guinea, F., Vozmediano, M.A.H., (2001) Phys. Rev. B, 63, p. 134421Nagamatsu, J., Nakagawa, N., Muranaka, T., Zenitani, Y., Akimitsu, J., (2001) Nature (London), 410, p. 63Dean, P., Martin, J.L., (1960) Proc. Roy. Soc., A259, p. 409Ladik, J., Seel, M., Otto, P., Bakhshi, A.K., (1986) Chem. Phys., 108, p. 203Galvão, D.S., Dos Santos, D.A., Laks, B., De Melo, C.P., Caldas, M.J., (1989) Phys. Rev. Lett., 63, p. 786Lavarda, F.C., Dos Santos, M.C., Galvão, D.S., Laks, B., (1994) Phys. Rev. Lett., 73, p. 1267Galvão, D.S., Laks, B., Da Silva, R.R., Torres, J.H.S., Kopelevich, Y., to be publishe
Structural Studies Of Magnetic Polymerized Fullerene
No full textX-ray and Raman measurements have been performed on samples of polymerized fullerenes, which show weak ferromagnetism. For pressure-polymerized fullerenes, ferromagnetic features are observed in a narrow temperature range very close to the limit of stability of the cages. Raman spectra show that the type of polymerization is probably of less importance. Strong structural inhomogeneity of the samples suggests that the magnetic phase forms a minority phase in a non-magnetic matrix.13701/03/1513351337Rao, A.M., Zhou, P., Wang, K.A., Hager, G.T., Holden, J.M., Wang, Y., Lee, W.T., Amster, I.J., (1993) Science, 259, p. 955Iwasa, Y., Arima, T., Fleming, R.M., Siegrist, T., Zhou, O., Haddon, R.C., Rothberg, L.J., Yagi, T., (1994) Science, 264, p. 1570Sundqvist, B., (1999) Adv. Phys., 48, p. 1Makarova, T.L., Liu, B.-B., Sundqvist, B., (2001) AIP Conference Proceedings, 591, p. 57Murakami, Y., Suematsu, H., (1996) Pure Appl. Chem., 68, p. 1463Makarova, T.L., Sundqvist, B., Esquinazi, P., Höhne, R., Kopelevich, Y., Scharff, P., Davydov, V.A., Rakhmanina, A.V., (2001) Nature, 413, p. 716Wood, R.A., Lewis, M.H., Lees, M.R., Bennington, S.M., Cain, M.G., Kitamura, N., (2002) J. Phys.: Condens. Matter, 14, pp. L385Moret, R., Launois, P., Wågberg, T., Sundqvist, B., (2000) Eur. Phys. J. B, 15, p. 253Blank, V.D., Buga, S.G., Dubitsky, G.A., Serebryanaya, N.R., Popov, M.Yu., Sundqvist, B., (1998) Carbon, 36, p. 319Makarova, T.L., Scharff, P., Sundqvist, B., Gaevski, M.E., Davydov, V.A., Rakhmanina, A.V., Kashevarova, L.S., (2001) Carbon, 39, p. 220
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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