论文标题
磁场诱导的UTE2中超导特征的变化
Change of superconducting character in UTe2induced by magnetic field
论文作者
论文摘要
UTE2是最近发现的自旋三旋转超导体。 UTE2的特征特征之一是当H完全平行于B轴时，高于16 t的磁场（H）增强的超导性。迄今为止，尚未对这种超导（SC）状态进行彻底研究，SC特性以及此高H SC（HHSC）阶段的自旋状态尚不清楚。在这项研究中，我们进行了交流磁化率和核磁共振（NMR）测量值，发现高达24.8 t，HHSC态对UTE2固有，并且对H角度非常敏感，并且其SC特性与低H SC（LHSC）状态的SC特性不同。自旋三个对的主要自旋成分沿LHSC状态的A轴，但在HHSC状态沿B轴变化。我们的结果表明，H诱导的多个SC状态源自其余自由度的自由度。
UTe2 is a recently discovered spin-triplet superconductor. One of the characteristic features of UTe2 is a magnetic field (H)-boosted superconductivity above 16 T when H is applied exactly parallel to the b axis. To date, this superconducting (SC) state has not been thoroughly investigated, and the SC properties as well as the spin state of this high-H SC (HHSC) phase are not well understood. In this study, we performed AC magnetic susceptibility and nuclear magnetic resonance (NMR) measurements and found that, up to 24.8 T, the HHSC state is intrinsic to UTe2 and quite sensitive to the H angle, and that its SC character is different from that in the low-H SC (LHSC) state. The dominant spin component of the spin-triplet pair is along the a axis in the LHSC state but is changed in the HHSC state along the b axis. Our results indicate that H-induced multiple SC states originate from the remaining spin degrees of freedom.
