Antiferromagnetically Enhanced ^<13>C Spin-Lattice Relaxation in K_3C_<60>-No Evidence of Electronic Multi-Sites
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概要
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We report a study of "C NIVIR spin-lattice relaxation in the superconducting fulleride K3C6Oat low temperatures ('z'). The experimentally obtained relaxation data, which are scaled to a Tindependent .relaxation shape, ar.e found to be well reprodtrced by the anisotropy parametero"" H A7:)"/A':';", where A7:)" and A:" are the isotropic and anisotropic part of the"C hyperfine coupling of conduction electrons, respectively. Simulation for a powder sampie with various .Spl11 values indicates that the deviation from a single-exponential relaxationis largest when the hyperfine coupling is isotropic to some extent (i.e., .SplIL t 0.5) instead ofpurely anisotropic (i.e., a"" : O). These results justify a model based on the electronic singlesite. Moreover, from the validity of the extended Korringa relation with K (a) : 5.7, it is foundthat the electronic state is a Fermi liquid in which the relaxation rate is enhanced substantiallyby the antiferromagnetic electron interaction.
- 社団法人日本物理学会の論文
- 1996-12-15
著者
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Matsuda Azusa
Ntt Basic Research Laboratories
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Sasaki Susumu
NTT Basic Research Laboratories
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C.W. CHU
Department of Physics and Texas Center for Superconductivity,University of Hauston
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Chu C.W.
Department of Physics and Texas Center for Superconductivity,University of Hauston
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