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Cu NMR study of the superconducting thiospinel Cu1.5Rh1.5S4 |
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| Authors: | Takashi Ohno Yutaka Kishimoto Kazuo Miyatani Masayasu Ishikawa |
| Institution: | a Department of Physics, Faculty of Engineering, Tokushima University, Tokushima 770, Japan b Department of Physics, Faculty of Science, Ehime University, Matsuyama 790, Japan c Institute for Solid State Physics, University of Tokyo, Roppongi, Tokyo 106, Japan |
| Abstract: | The 63Cu NMR Knight shift K and spin-lattice relaxation rate 1/T1 have been measured to study the thiospinel superconductor Cu1.5Rh1.5S4 from a microscopic viewpoint. K is negative and has a weak dependence on temperature, and the hyperfine coupling constant Hhfd is estimated to be ?52.4 kOe/μB. 1/T1 is proportional to the temperature in the normal state. In the superconducting state, 1/T1 takes a coherence peak just below Tc, and decreases exponentially well below Tc, from whose temperature dependence the superconducting energy gap has been proved to be close to 2Δ = 3.52kBTc given by the BCS theory. |
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