Thermodynamic and electrical transport properties of UTe 2 under uniaxial stress
Thermodynamic and electrical transport properties of UTe 2 under uniaxial stress
复制标题
单轴应力下UTe 2 的热力学和电输运特性
DOI：
10.1103/physrevb.106.l121101
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发表时间：
2022
影响因子：
3.7
通讯作者：
Girod C
中科院分区：
文献类型：
--
作者：
Girod C
尽管进行了大量的实验研究，但非常规超导序参量的性质仍然难以捉摸。这个难题源于在环境压力下的单或双超导转变以及复杂的压力-温度相图的报告。为了解决这个问题，我们测量了在沿着不同晶向施加单轴压缩应力下的热容和电阻率。我们发现，单一观测到的体超导转变的临界温度沿[100]和[110]方向降低，沿[001]方向升高。除了它的影响，轴向应力导致显着的压阻。重要的是，面内剪切应力不会引起任何可观察到的分裂的超导过渡的应力范围。这一结果表明，在常压下的超导序参量可能是单分量的.
Despite intense experimental efforts, the nature of the unconventional superconducting order parameter ofremains elusive. This puzzle stems from reports of either a single or a double superconducting transition at ambient pressure as well as a complex pressure-temperature phase diagram. To address this issue, we measured the heat capacity and electrical resistivity ofunder compressive uniaxial stressapplied along different crystallographic directions. We find that the critical temperatureof the single observed bulk superconducting transition decreases withalong [100] and [110] but increases withalong [001]. Aside from its effect on,-axis stress leads to a significant piezoresistivity. Importantly, an in-plane shear stressdoes not induce any observable splitting of the superconducting transition over a stress range of. This result suggests that the superconducting order parameter ofmay be single component at ambient pressure.