322,979 research outputs found
Determination of local distortions in the charge ordered and CMR La1-xCaxMnO3 manganites
No full textData Files for "Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet"
No full textData files for the manuscript "Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet".
Reference: A. Nag, A. Nocera, S. Agrestini, M. Garcia-Fernandez, A. C. Walters, Sang-Wook Cheong, S. Johnston, and Ke-Jin Zhou, "Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet". Nature Communications 13, 2327 (2022).
Preprint: arXiv:2111.03625 (2021), URL: https://arxiv.org/abs/2111.0362
Resonant X-ray scattering study of Ca3Co2O6 ground state: Preliminary results of magnetic field effects
No full textWe present resonant magnetic X-ray scattering (RMXS) measurements in an applied magnetic field on a single crystal of Ca3Co2O6. We focus our attention on the transition from an incommensurate partially disordered antiferromagnetic state to a ferrimagnetic state: a lock-in and a divergence of the magnetic correlation length at the transition shed light on the nature of the ground state and on the c-axis vs. in-plane exchange couplings in this system. (C) 2009 Elsevier B.V. All rights reserved
Resonant x-ray scattering investigation of the multipolar ordering in Ca3Co2O6
No full textWe have performed a resonant x-ray scattering (RXS) study near the Co K edge on a single crystal of Ca3Co2O6. In the magnetically ordered phase a new class of weak reflections appears at the magnetic propagation vector (tau) over right arrow similar or equal to(1/3,1/3,1/3). These new reflections allow direct access to the dipolar-quadrupolar E1E2 scattering channel. The theoretical possibility of observing isolated E1E2 electromagnetic multipoles has attracted a lot of interest in recent years. Unfortunately in many systems of interest, parity even and parity odd tensor contributions occur at the same positions in reciprocal space. We demonstrate that in Ca3Co2O6 it is possible to completely separate the parity even from the parity odd terms. The possibility of observing such terms even in globally centrosymmetric systems using RXS has been investigated theoretically; Ca3Co2O6 allows a symmetry based separation of this contribution
Incommensurate magnetic ground state revealed by resonant x-ray scattering in the frustrated spin system Ca3Co2O6
No full textWe have performed a resonant x-ray scattering study at the Co pre-K edge on a single crystal of Ca3Co2O6. The measurements reveal an abrupt transition to a magnetically ordered state immediately below T-N=25 K, with a magnetic correlation length in excess of 5500 A along the c axis chains. There is no evidence for modifications to the Co3+ spin state. A temperature dependent modulation in the magnetic order along the c axis and an unusual decrease in the magnetic correlation lengths on cooling are observed. The results are compatible with the onset of a partially disordered antiferromagnetic structure in Ca3Co2O6
The strain of CuO2 lattice: the second variable for the phase diagram of cuprate perovskites
No full textNMR study of magnetic order, metamagnetic transitions, and low-temperature spin freezing in Ca_{3}Co_{2}O_{6}
No full textWe report on a (59)Co NMR investigation of the trigonal cobaltate Ca(3)Co(2)O(6) carried out on a single crystal, providing precise determinations of the electric field gradient and chemical shift tensors, and of the internal magnetic fields at the nonmagnetic Co I sites, unavailable from former studies on powders. The magnetic-field-induced ferri-and ferromagnetic phases at intermediate temperature (e.g., 10 K) are identified by distinct internal fields, well accounted for by purely dipolar interactions. The vanishing transferred hyperfine field at the Co I site indicates that the Co(3+) (I) orbitals do not participate in the intrachain superexchange, in disagreement with a previous theoretical model. The strong Ising character of the system is confirmed experimentally by the field dependence of the resonance lines, indicating that local moments are saturated even at the phase boundaries. In the vicinity of the critical fields, nuclear spin-spin relaxations detect the spin-reversal dynamics of large magnetic assemblies, either Ising chain fragments or finite-size domains, which drive the metamagnetic transitions. Such collective excitations exhibit a glassy behavior, slowing down to subacoustic frequencies and freezing at low temperature. The relevance of such slow-fluctuation modes for the low-temperature multistep behavior reported in the magnetization is discussed
Giuseppe Alberigo (éd.), Conciliorum Oecumenicorum Generaliumque Decreta. Editio Critica. I, The Oecumenical Councils. From Nicaea I To Nicaea II (325-787). Curantibus G. Alberigo, A. M. Ritter, L. Abramowski, E. Mühlenberg, P. Conte, H.-G. Thümmel, G. Nedungatt, S. Agrestini, E. Lamberz, J. B. Uphus
No full textFailler Albert. Giuseppe Alberigo (éd.), Conciliorum Oecumenicorum Generaliumque Decreta. Editio Critica. I, The Oecumenical Councils. From Nicaea I To Nicaea II (325-787). Curantibus G. Alberigo, A. M. Ritter, L. Abramowski, E. Mühlenberg, P. Conte, H.-G. Thümmel, G. Nedungatt, S. Agrestini, E. Lamberz, J. B. Uphus. In: Revue des études byzantines, tome 66, 2008. pp. 259-260
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
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