125,311 research outputs found
Heavy Ions Irradiation Effects On Magnetization Of Tl2ba2cacu2o8 And Tlba2cacu2o7 Single Crystals
No full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Magnetization measurements were performed as a function of magnetic field and time in Tl2Ba2CaCu2O8 and TlBa2CaCu2O7 single crystals to study the effects of high energy Xe ion irradiation. The effective pinning energies at 6 K and 40 K have been evaluated from magnetic relaxation measurements. The activation energies are hardly changed after irradiation. The study of magnetization hysteresis shows that an irradiation fluence of 2 × 1011 ions cm-2 enhanced hysteresis at 6 K in both crystals. But a fluence of 1012 ions cm-2 was detrimental for the 2212 sample which is the most sensitive to heavy ion irradiation damage in the Tl-cuprate family. The magnetic hysteresis at 70 K after irradiation is more drastically increased than at 6 K. This spectacular modification is interpreted by a recovery of the 3D character of the flux line lattice. © 1992.13427928507/57630-5; FAPESP; Simons Foundation; 2013/09850-7; FAPESP; Simons Foundation; DMR-1005751; NSF; Simons Foundation; PHYS-1066293; NSF; Simons Foundation; SF; Simons FoundationFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Umezawa, Crabtree, Liu, Weber, Kwok, Nunez, Moran, Claus, (1987) Phys. Rev. B, 36, p. 7151van Dover, Gyorgy, White, Schneemeyer, Felder, Wasczak, (1990) Appl. Phys. Lett., 56, p. 2681Civale, Warwick, McElfresh, Worthington, Malozemoff, Holzberg, Thompson, Kirk, (1990) Phys. Rev. Lett., 65, p. 1164Kritscha, Sauerzopf, Weber, Crabtree, Chang, Jiang, Flux Pinning Enhancement and Shift of the Irreversibility Line by Fast Neutron Irradiation of Single Crystal Bi2Sr2CaCu2O8 (1990) Europhysics Letters (EPL), 12, p. 179Vichery, Rullier-Albenque, Pascard, Konczylowski, Kormann, Favrot, Collin, (1989) Physica C, 159, p. 697Bourgault, Bouffard, Toulemonde, Groult, Provost, Studer, Nguyen, Raveau, (1989) Phys. Rev. B, 39, p. 6549Bourgault, Hervieu, Bouffard, Groult, Raveau, (1989) Nucl. Instrum. Methods B, 42, p. 61Hardy, Groult, Hervieu, Provost, Raveau, Bouffard, (1991) Nucl. Instrum. Methods B, 54, p. 472Venturini, Barbour, Ginley, Baughman, Morosin, (1990) Appl. Phys. Lett., 56, p. 2456Osborn, (1945) Phys. Rev., 67, p. 351Yeshurun, Malozemoff, Holtzberg, Dinger, (1988) Phys. Rev. B, 38, p. 11828Campbell, Fruchter, Cabanel, (1990) Phys. Rev. Lett., 64, p. 1561Xu, Suenaga, Moodenbaugh, Welch, (1989) Phys. Rev. B, 40, p. 10882Stollman, Dam, Emmen, Pankert, (1989) Physica C, 161, p. 444Beasley, Labush, Welb, (1969) Phys. Rev., 181, p. 682Martin, Maignan, Provost, Michel, Hervieu, Tournier, Raveau, (1990) Physica C, 168, p. 8Hardy, Groult, Provost, Hervieu, Raveau, Bouffard, (1991) Physica C, 178, p. 255Raveau, Hervieu, Michel, Provost, (1989) Mater. Sci. Eng., 109 A, p. 281Hardy, Hervieu, Groult, Provost, (1991) Radiation Effects and Defects in Solids, , in the pressKopylev, Schegolev, Togonidze, Magnetization curves and low critical fields of Tl2Ba2CaCu2Ox single crystals (1989) Physica C: Superconductivity, 162-164, p. 1143Kopylev, Koshelev, Schegolev, Togonidze, The role of surface effects in magnetization of high-Tc superconductors (1990) Physica C: Superconductivity, 170, p. 291Kes, Aarts, van den Berg, van der Beek, Mydoch, (1989) Supercond. Sci. Technol., 1, p. 242Palstra, Batlogg, Scheemeyer, Wasczak, (1991) Phys. Rev. B, 43, p. 3756de Rango, Giordanengo, Tournier, Sulpice, Chaussy, Deutscher, Genicon, Raveau, The « irreversibility line » of Bi2-xPbxSr2Ca2Cu3O10 : a possible breakdown of an intrinsic proximity effect (1989) Journal de Physique, 50, p. 2857Raveau, Michel, Provost, Hervieu, The nature and the role of rock salt-type layers in superconductive layered copper oxides (1990) Solid State Ionics, 40-41, p. 785. , 1st ednV.Z. Kresin, S.A. Wolf and G. Deutscher, PreprintV. Hardy, J. Provost, D. Groult, M. Hervieu, B. Raveau, S. Durcok, E. Pollert, J.-C. Frison, J.-P. Chaminade and M. Pouchard, Physica C, accepted for publicationKonczykowski, Rullier-Albenque, Yacoby, Shaulov, Yeshurun, Lejay, (1991) Phys. Rev. B, 44, p. 7167Civale, Marwick, Worthington, Kirk, Thompson, Krusin-Elbaum, Sun, Holtzberg, (1991) Phys. Rev. Lett., 67, p. 64
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Oxycarbonates thin films grown by pulsed laser deposition: from a single target system to a multi-target system
No full textThe microstructural study of superconductor thin films with general formula: (CaCuO2)(m)(Ba2CuO2CO3)(n), grown from a single target, has shown that these films exhibited numerous intergrowth phases. Such films can not be used for precise physical studies. To obtain a regular stacking along a growth direction perpendicular to the substrate a multi-target system has to be used. The preliminary results of this study are presented herein
Dos Bloques de 39 Viviendas” - Polígono Arrahona Sabadell
No full textDue Blocchi di allogi sociali;
Libri:
– V.V.A.A.: DMAH 2007-2010 ed. Departament de Medi Ambient i Habitatge, Generalitat de Catalunya, Barcellona 2010, pg.104.
– VVAA: Noves Formes de Promoció d ́Habitatge Assequible, Ed. Generalitat de Catalunya, Barcellona 2010. Pg.104 (D.L.: B 32.837-2012)
– VVAA: INCASOL 30 anys: l ́enfortiment del territorio i el país
Ed. Generalitat de Catalunya, Barcelona 2010, pag.135 (ISBN: 978-84-393-8399-4)
Mostre:
– Vers des Nouveaux Logements Sociaux 2, Cité de l ́Architecture et du Patrimoine, 13 Mars 201
High Tc superconducting oxycarbonate thin films grown by laser ablation : Promising new materials
No full textSuperconducting thin films of copper oxycarbonates, with the general composition (CaCuO2)m(Ba2-xAxCuO 2CO3)n (A=Ca,Sr), have been synthesized for the first time using the pulsed laser deposition technique. Via a single target system, i.e. a Ba2Ca3Cu4Ox target, the film exhibits a Tc(onset) of 110K. The m=0 member of the family, Ba2-xAxCuO2CO3, has also been studied. Structures and structural mechanisms are presented
Pulsed laser deposition of Ba(2-x)A(x)CuO(2)CO(3) (A=Ca, Sr) thin films, m=0 member of the series (CaCuO2)(m)(Ba(2-x)A(x)CuO(2)CO(3))(n) (A=Ca, Sr)
No full textCopper oxycarbonate thin films of the (CaCuO2)(m)(Ba(2-x)A(x)CuO(2)CO(3))(n) (A = Ca, Sr) system have been deposited, using the pulsed laser deposition (PLD) technique, on (100) LaAlO3 and (110) NdGaO3 substrates. The m = 0 member of the family, Ba2-xSrxCuO2CO3 (x = 0.1 and x = 0.4) has been deposited in a selective way for the first time on both LaAlO3 and NdGaO3. The best results have been obtained for NdGaO3 substrates, but a double orientation of the film, [001] and [110], is found by transmission electron microscopy (TEM) for x = 0.4. Ba2-xCaxCuO2CO3 (x = 0.2) has also been studied. At a deposition temperature of 620 degrees C, a Ba2CuO2CO3 (B2CC) type structure is stabilized, whereas at 680 degrees C another perovskite is isolated. Attempts to deposit the member (m = 1, n = 1, x = 0) of the family, i.e., Ba2CaCu2O4CO3, on LaAlO3 using a single multiphase sintered ceramic target led to the formation of a B2CC type structure (m = 0) coherently intergrown with CaCu2O3 and Ca2CuO3 extended defects. The structures and structural mechanisms are discussed. No diamagnetic transition was observed in any of these films down to 5 K
Films minces d'oxycarbonates preparees par ablation laser pulsee : du systeme monocible au systeme multicible
No full textThe microstructural study of superconductor thin films with general formula: (CaCuO2)m(Ba2CuO2CO 3)n, grown from a single target, has shown that these films exhibited numerous intergrowth phases. Such films can not be used for precise physical studies. To obtain a regular stacking along a growth direction perpendicular to the substrate a multi-target system has to be used. The preliminary results of this study are presented herein
Ba2-xSrxCuO2CO3: A Series of Oxycarbonate Thin Films Grown by Pulsed Laser Deposition on NdGaO3 Substrates
No full textMonophasic thin films of the oxycarbonates Ba2-xSrxCuO2CO3 have been grown by pulsed laser deposition on [110]-oriented NdGaO3 substrates for x = 2, 1.6, 0.9, 0.4, and 0.3. A systematic study of these films by X-ray diffraction and transmission electron microscopy shows that the film orientation varies from a-axis or [110] orientation (copper layers perpendicular to the substrate) to a c-axis or [001] orientation (copper layers parallel to the substrate) as x decreases. Sr2CuO2CO3 (x = 2) is indeed a-axis oriented, whereas for 0.4 < x < 1.6 these films have a [110] orientation, and finally for x = 1.6-1.7 the films exhibit c-axis, [110]- and [110]-oriented domains. The factors which influence the orientation of these films are discussed
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