Large and homogeneous mass enhancement in the rattling-induced superconductor KOs2O6

Article

关键词: ELECTRONIC-STRUCTURE;    CRYSTAL-STRUCTURE;    FERMI-SURFACE;    PYROCHLORE;    RBOS2O6;    NB3SN;    FIELD;    HEAT;   

DOI  :  10.1103/PhysRevB.85.180503

来源: SCIE

【 摘 要 】

We have determined the Fermi surface in KOs2O6 (T-c = 9.6 K and B-c2 similar to 32 T) via de Haas-van Alphen (dHvA) oscillation measurements and a band structure calculation. We find effective masses up to 26(1)m(e) (m(e) is the free electron mass), which are unusually heavy for compounds where the mass enhancement is mostly due to electron-phonon interactions. Orbit-resolved mass enhancement parameters lambda(dHvA) are large but fairly homogeneous, concentrated in the range 5-8. We discuss origins of the large homogeneous mass enhancement in terms of rattling motion of the K ions.

【 授权许可】

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