μ− SR studies of oxide-superconductorsSR studies of oxide-superconductors |
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| Authors: | N Nishida S Okuma H Miyatake S Shiratake Y Hidaka T Murakami Y Ueda K Kosuge S Kambe H Yasuoka H Takagi S Uchida K Nishiyama K Nagamine Y Kuno T Yamazaki |
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| Institution: | (1) Dept. of Physics, Tokyo Institute of Technology, Meguro-ku, 152 Tokyo, Japan;(2) NTT Optoelectronics Laboratories, Tokai, 319-11 Ibaraki, Japan;(3) The Institute for Solid State Physics, U. of Tokyo, Roppongi, Minato-ku, 106 Tokyo, Japan;(4) Dept. of Chemistry, University of Kyoto, Kyoto, Japan;(5) Engineering Research Institute, University of Tokyo, Bunkyo-ku, 113 Tokyo, Japan;(6) Meson Science Laboratory, U. of Tokyo, Bunkyo-ku, 113 Tokyo, Japan;(7) TRIUMF, Vancouver, B.C., Canada;(8) Institute for Nuclear Study, Tanashi, Tokyo, Japan |
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| Abstract: | The negative muon spin rotation method (μ− SR) has been applied to studies of electronic states at oxygen sites of oxide superconductors YBa2Cu3O7, Nd2−x
Ce
x
CuO4−δ (x=0.15, oxygen reduced), LiTi2O4 and related oxide-insulators La2CuO4−δ, CuO, Cu2O. The paramagnetic shifts of μ− trapped at oxygen nuclei in these polycrystalline powder samples have been measured at 300 K. All the measured shifts are
positive. In copper-oxides the paramagnetic shifts are of the order 10−3, while in LiTi2O4 is very small (8.4±3.34×10−5). In YBa2Cu3O7, a fast μ− spin relaxation timeT
2
* (∼ 200 ns) has been observed; the reason for this is unknown and further studies are now in progress. |
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