Ni-impurity effect in high-Tc cuprates studied by neutron scattering and XAFS spectroscopy

被引：2

作者：

Hiraka, H. ^{[1
]}

Wakimoto, S. ^{[2
]}

Matsuda, M. ^{[2
]}

Matsumura, D. ^{[3
]}

Nishihata, Y. ^{[3
]}

Mizuki, J. ^{[3
]}

Yamada, K. ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Ibaraki 3191195, Japan

[3] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Kobe, Hyogo 6795148, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 12期

关键词：

Neutron scattering; XAFS;

D O I：

10.1016/j.jpcs.2008.06.043

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Neutron scattering experiments using La2-xSrxCu1-yNiyO4 clarified that the parallel spin-density\ modulations (SDMs) in the superconducting phase are susceptible to Ni, in the same way as the diagonal SDMs in the insulating spin-glass phase. Ni substitution reduces the mobile hole concentration from x down to x-y. Polarized XAFS measurements using Ni K-edge probe two types of Ni valence states; Ni2+ and Ni(2+x)+. It indicates that a strong hole localization occurs around Ni, resulting in an effective spin-1/2 value at Ni sites. Therefore, a charge impurity nature of Ni is most likely realized when x >= y. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3136 / 3138

页数：3

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