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Enhancing Superconductivity of the Nonmagnetic Quasiskutterudites by Atomic Disorder

机译：通过原子紊乱提高非磁性拟磷酸钠的超导性

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摘要

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with Tc⋆>Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc⋆∼2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase Tc⋆ in respect to the bulk Tc one and proposed a model that explains the Tc⋆>Tc behavior in the series of nonmagnetic skutterudite-related compounds.
机译：我们研究了通过非磁性原子障碍在填充的斯凯术相关化合物（La3M4SN13，Ca3RH4SN13，Y5RH6SN18，Lu5RH6Sn18，Lu5RH6Sn18; M = Co，Ru，Rh）中产生非磁性原子障碍的效果，其中原子紊乱是由各种产生的缺陷或掺杂。我们已经表明，在这些非磁性磷酸钠超导体中相干长度ψ的混乱另外产生与TC1> TC（稀释紊乱场景）的非均匀高温超导相，而由于掺杂增加导致的化学计量强烈波动甚至可以迅速提高样品的超导转变温度，甚至于TC1〜2TC的值（致密障碍导致强不均匀性）。这种现象似乎是高温超导体和超导重型费米的特征，最近已获得重新关注。我们在实验上记录了对散装Tcα的不均匀超导相TC1的更强的晶格加强，并提出了一种模型，该模型解释了该系列非磁性卓越岩相关化合物中的TC⋆> TC行为。

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