Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point
Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point
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DOI：
10.1103/physrevb.105.054510
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发表时间：
2021-08
影响因子：
3.7
通讯作者：
Jaglul Hasan;M. Dzero;M. Khodas;A. Levchenko
中科院分区：
文献类型：
--
作者：
Jaglul Hasan;M. Dzero;M. Khodas;A. Levchenko
在这项工作中，我们研究的量子临界多带非常规超导体的热力学表现。作为一个指导性的例子，我们考虑的情况下，磁量子临界点的模型，捕捉超导共存的自旋密度波。我们表明，在超导序参量在孤立点处有偶然节点的情况下，量子磁涨落导致伦敦穿透深度的相对T -线性斜率的重整化。这导致作为掺杂的函数的渗透深度的非单调依赖性和伴随的峰结构跨越量子临界点。此外，我们确定的贡献，在共存阶段的开始时的比热的磁波动。我们的理论分析是通过比较我们的结果与最近的实验数据从低温热力学测量在BaFe 2（As 1-xPx）2的最佳组成得到证实。
In this work we study thermodynamic manifestations of the quantum criticality in multiband unconventional superconductors. As a guiding example we consider the scenario of magnetic quantum critical point in the model that captures superconductivity coexistence with the spin-density wave. We show that in situations when the superconducting order parameter has incidental nodes at isolated points, quantum magnetic fluctuations lead to the renormalization of the relative T -linear slope of the London penetration depth. This leads to the nonmonotonic dependence of the penetration depth as a function of doping and the concomitant peak structure across the quantum critical point. In addition, we determine contribution of magnetic fluctuations to the specific heat at the onset of the coexistence phase. Our theoretical analysis is corroborated by making a comparison of our results with the recent experimental data from the low-temperature thermodynamic measurements at optimal composition in BaFe2(As1−xPx)2.