量子临界多带超导体中竞争序的约瑟夫音速诊断
Josephsonic diagnostic of competing orders in quantum critical multiband superconductors
摘要：
受最近实验观察到的多带超导体热力学性质中量子临界点涨落现象的启发，我们导出了在超导共存阶段中两个超导体之间各种结的约瑟夫森电流与自旋密度波的一般表达式。我们证明了临界电流峰值在分离纯超导相和混合超导相的量子临界点。我们认为，我们的研究结果是通用的，特别是，可以采用解释最近的观察到的非单调依赖于外部压力的超导重费米子超导体CeRhIn $_5$，和化学掺杂的铁基超导体，如Ba（Fe $_{1-x}$ Co $_x$）$_2$作为$_2$。
英文摘要：
Motivated by the recent experimentally observed manifestations of the quantum critical point fluctuations in the thermodynamic properties of multiband superconductors, we derive a general expression for the Josephson current of various junctions between two superconductors in the phase of superconductivity coexistence with the spin-density-wave. We demonstrate that the critical current peaks at the quantum critical point that separates pure and mixed superconducting phases. We argue that our results are generic and, in particular, can be adopted to explain the recent observations of a nonmonotonic dependence of the supercurrent on the external pressure in the heavy fermion superconductor CeRhIn$_5$, and on the chemical doping in iron-based superconductors such as Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$.
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