Superconductivity in quasicrystals poses a new challenge in condensed matter physics. We measured the resistance and ac magnetic susceptibility of a Ta_1.6Te dodecagonal quasicrystal, which is superconducting below T_c ~ 1 K. We show that the upper critical field increases linearly with a large slope of − 4.4 T/K with decreasing temperature down to 0.04 K, with no tendency to level off. The extrapolated zero-temperature critical field exceeds the Pauli limit by a factor of 2.3. We also observed flux-flow resistance with thermally activated behavior and an irreversibility field that is distinct from the upper critical field. We discuss these peculiarities in terms of the nonuniform superconducting gap and spin-orbit interaction in quasicrystal structures.

准晶体中的超导性对凝聚态物理提出了新的挑战。我们测量了 Ta _1.6 Te 十二角准晶的电阻和交流磁化率，该准晶在 T _c ~ 1 K 以下时具有超导性。随着温度降低至 0.04 K，斜率为 − 4.4 T/K，且没有趋于平稳的趋势。外推的零温临界场超出泡利极限 2.3 倍。我们还观察到具有热激活行为的通量流阻力和与上临界场不同的不可逆场。我们根据准晶结构中的不均匀超导能隙和自旋轨道相互作用来讨论这些特性。