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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Theory of (s + id) pairing in mixed-valent correlated metals
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Theory of (s + id) pairing in mixed-valent correlated metals

机译：（S + ID）与混合价相关金属配对的理论

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Motivated by the recent discovery of superconductivity in square-planar nickelates as well as by longstanding puzzling experiments in heavy-fermion superconductors, we study Cooper pairing between correlated d electrons coupled to a band of weakly correlated electrons. We perform self-consistent large N calculations on an effective t - J model for the d electrons with additional hybridization. Unlike previous studies of mixed-valent systems, we focus on parameter regimes where both hybridized bands are relevant to determine the pairing symmetry. For sufficiently strong hybridization, we find a robust (s + id) pairing which breaks time-reversal and point-group symmetries in the mixed-valent regime. Our results illustrate how intrinsically multiband systems such as heavy fermions can support a number of highly nontrivial pairing states. They also provide a putative microscopic realization of previous phenomenological proposals of (s + id) pairing and suggest a potential resolution to puzzling experiments in heavy-fermion superconductors such as U_(1-x)Th_xBe_(13) which exhibit two superconducting phase transitions and a full gap at lower temperatures.
机译：通过在方形平面镍中发现超导电性以及通过重型超导体的长期令人困惑的实验的激励，我们研究了耦合到弱相关电子的带的相关D电子之间的库克配对。我们对具有额外杂交的D电子的有效T - J模型进行自我一致的大n计算。与以往的混合价体系的研究不同，我们专注于两个杂交频带与确定配对对称性相关的参数制度。对于足够强烈的杂交，我们发现一个强大的（S + ID）配对，它在混合体制中断了在混合体制中的时间逆转和点组对称。我们的结果说明了诸如重型费米域等本质多频带系统可以支持许多高度非活动的配对状态。它们还提供了先前的（S + ID）配对的推定的显微镜实现，并提出了对诸如U_（1-x）TH_XBE_（13）的重型超导体（如U_（1-x）TH_XBE_（13）中的令人困惑的实验）的潜在分辨率较低温度下的全部间隙。

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