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Large and homogeneous mass enhancement in the rattling-induced superconductor KOs_2O_6

机译:咔嗒声诱导的超导体KOs_2O_6的质量大而均匀地增强

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We have determined the Fermi surface in KOs_2O_6 (T_c = 9.6 K and B_(c2) ~ 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 λ_(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.
机译:通过de Haas-van Alphen(dHvA)振荡测量和能带结构计算,我们确定了KOs_2O_6中的费米表面(T_c = 9.6 K和B_(c2)〜32 T)。我们发现有效质量高达26(1)m_e(m_e是自由电子质量),对于质量增强主要归因于电子-声子相互作用的化合物而言,该质量异常重。轨道分辨的质量增强参数λ_(dHvA)大但相当均匀,集中在5-8范围内。我们从K离子的咔嗒声运动中讨论了大质量均质增强的起源。

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