C-13 NMR and static magnetic susceptibility in C-60 superconductors: Possible influence of Kondo impurity

Article

关键词: ELECTRON-SPIN-RESONANCE;    ALKALI FULLERIDES;    RB3C60;    K3C60;    DENSITY;   

DOI  :  10.1103/PhysRevB.58.11603

来源: SCIE

【 摘 要 】

The static spin susceptibility, chi(s)(SQ) and chi(s)(NMR), in C-60 superconductors K3C60 and Rb3C60 was studied using a de superconducting quantum interference device magnetometer and C-13 NMR. We found that chi(s)(SQ) has a peculiar temperature (T) dependence behaving as (1 - CT2) with a positive constant C similar to(1 x 10(-6)) deg(-2) contrary to the almost T independent chi(s)(NMR). These observations indicate a possibility that there exist Kondo-like impurities, whose Kondo temperature is similar to 500 K and whose content is similar to 0.001 spins per carbon. On the basis of these studies, the lattice constant dependence of the intrinsic spin susceptibility was established to be d chi(s)/da(0) =(5.7+/-0.4) x 10(-4) emu/mol C-60/Angstrom in A(3)C(60) superconductors where A is an alkali metal. [S0163-1829(98)02241-3].

【 授权许可】

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