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Charge and spin states of Ru and Cu in magnetic superconductor RuSr2GdCu2O8 studied by NMR

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Title: Charge and spin states of Ru and Cu in magnetic superconductor RuSr2GdCu2O8 studied by NMR
Authors: Kumagai, Ken-ichi1 Browse this author →KAKEN DB
Takada, Satomi Browse this author
Furukawa, Yuji Browse this author
Authors(alt): 熊谷, 健一1
Issue Date: 2001
Publisher: American Physical Society
Volume: 63
Start Page: 180509(R)
Publisher DOI: 10.1103/PhysRevB.63.180509
Abstract: Electronic and magnetic properties of RuSr2GdCu2O8 have been investigated by electric resistivity, magnetization, and Cu-, Ru-NMR measurements. Magnetic order (TM5133 K) and superconductivity [Ts(onset);52 K] have been confirmed. We observed two kinds of Ru-NMR signals (the hyperfine fields of 101Ru are 590 kOe and 290 kOe), suggesting a charge segregation of Ru5+ (S-3/2) and Ru4+ (S=1) in the RuO2 layers. The hyperfine field at the Cu site is diminishingly small, indicating magnetic interactions between CuO2 and RuO2 layers are weak. Assuming that holes are inherently doped in the CuO2 layers from the (Ru4+, Ru5+)O2 layers, the high-Tc superconductivity can occur under weak magnetic interactions between Ru and Cu spins in RuSr2GdCu2O8.
Rights: Copyright © 2001 American Physical Society
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 熊谷 健一

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