论文标题
非中心对称RE5.5TA的非常规的超导特性
Unconventional superconducting properties of noncentrosymmetric Re5.5Ta
论文作者
论文摘要
基于rhenium的非中心对称超导体在$α$ -MN结构中结晶已成为潜在的候选者，以表现出非常规超导地面状态。在这里，我们报告了RE $ _ {5.5} $ TA的超导和正常状态属性的详细调查，该属性还具有$α$ -MN结构。磁化，特定的热量和传输测量结果证实了大量超导过渡\ textIt {t} $ _ {c} $ 8.0 k。 re $ _ {5.5} $ ta本质上可能是非常规的。然而，低温特异性热和横向场躯体自旋旋转测量结果表明，尽管具有强的电子 - phonon耦合，但具有令人惊讶的无节性各向同性超导间隙。
Rhenium based noncentrosymmetric superconductors crystallizing in $α$-Mn structure have become potential candidates to exhibit an unconventional superconducting ground-state. Here we report a detailed investigation on the superconducting and normal state properties of Re$_{5.5}$Ta, that also has the $α$-Mn structure. Magnetization, specific heat, and transport measurements confirm the bulk superconducting transition \textit{T}$_{C}$ at 8.0 K. Upper critical field value (H$_{C2}$(0)) calculated from magnetization, specific heat and AC transport measurements exceed the Pauli paramagnetic limit (14.7 T), indicating that the superconducting properties of Re$_{5.5}$Ta are probably unconventional in nature. However, low-temperature specific heat and transverse-field muon spin rotation measurements suggest a surprising nodeless isotropic superconducting gap, although with strong electron-phonon coupling.
