Large positive magnetoresistance and transport properties of intercalated Cu oxides

被引:1
作者
Grigoryan, L [1 ]
Furusawa, M
Hori, H
Tokumoto, M
机构
[1] Univ Kentucky, Dept Phys, Lexington, KY 40506 USA
[2] JAIST, Hokuriku, Ishikawa 923, Japan
[3] ETL, Tsukuba, Ibaraki 305, Japan
关键词
D O I
10.1088/0953-8984/10/21/023
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Magnetism and electrical resistance as a function of magnetic field, temperature and chemical composition are studied in Cu oxides intercalated with metal phthalocyanines MPc, where M is Fe or Ni, and Pc is C32H16N8. An unusually large positive magnetoresistance (MR) similar to 1200% is observed in FePc-intercalated Bi2Sr2Can-1CunO2n+4 samples with n = 2. The magnitude of MR dropped to 40$ and similar to 0% in the FePc-intercalated n = 3 and n = 4 samples, respectively, and to similar to 300% in the NiPc-intercalated n = 2 sample. The possible mechanism responsible for the observed large MR is tentatively discussed in terms of a competition between the resonant spin-fluctuation and the spin-glass-like states.
引用
收藏
页码:4685 / 4698
页数:14
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