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首页> 外文期刊>Journal of the Physical Society of Japan >Superconducting gap of filled skutterudite superconductor LaRu4P12 studied by sub-meV resolution photoemission spectroscopy
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Superconducting gap of filled skutterudite superconductor LaRu4P12 studied by sub-meV resolution photoemission spectroscopy

机译:亚meV分辨率光发射光谱研究填充方钴矿超导体LaRu4P12的超导间隙

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摘要

We study the superconducting gap of the filled skutterudite superconductor LaRu4P12 (transition temperature T-c = 7.2 K) using a newly developed sub-meV resolution photoemission spectrometer with a vacuum-UV laser as a light source. The result at 4.8 K shows the opening of a superconducting gap, whose spectral shape is well explained with an isotropic s-wave Dynes function using a gap size of 1.3 meV. This corresponds to the reduced gap 2 Delta(0)/k(B)T(c) of 4.2. The temperature dependence of the superconducting gap shows fairly good agreement with the conventional BCS theory. The present results are consistent with those of a moderately strong-coupling and isotropic s-wave superconductor.
机译:我们使用真空紫外激光作为光源,使用新开发的sub-meV分辨率光发射光谱仪研究了填充的方钴矿超导体LaRu4P12(转变温度T-c = 7.2 K)的超导间隙。在4.8 K处的结果显示了一个超导缝隙的打开,该缝隙的光谱形状可以通过缝隙大小为1.3 meV的各向同性s波Dynes函数很好地解释。这对应于4.2的减小的间隙2 Delta(0)/ k(B)T(c)。超导间隙的温度依赖性与常规BCS理论显示出相当好的一致性。目前的结果与中等强度耦合和各向同性的s波超导体的结果一致。

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