Anomalous superconducting states of unconventional superconductors

我们用热输运测量研究了超导带隙对称性。特别地，我们通过在相对于晶轴的不同方向旋转的磁场中的热输运测量，确定了URu_2Si_2的超导带隙对称性。在这个系统中，超导电性发生在所谓的隐藏有序相，但超导电性的详细性质仍然不清楚。我们发现超导能隙函数不具有手征对称性，这在非常规超导体中是非常独特的。通过局域霍尔探针测量，我们还发现了超净URu_2Si_2单晶中的涡旋晶格熔化。我们还生长了CeIn_3和LaIn_3人工薄膜的外延薄膜。

We have studied the superconducting gap symmetry by the thermal transport measurements. Particularly, we have determined the superconducting gap symmetry of URu_2Si_2, by the thermal transport measurements in magnetic field rotating various directions relative to the crystal axes down to dilution refrigerator temperatures. In this system, superconductivity occurs within the so-called hidden order phase, but the detailed nature of the superconductivity is still unclear. We found that the superconducting gap function pas a chiral symmetry, which is quite unique among unconventional superconductors. We also found that the vortex lattice melting in ultraclean URu_2Si_2 single crystals, by the local Hall probe measurements. We have also grown the epitaxial thin films of artificial thin films of CeIn_3 and LaIn_3.