论文标题
在超导体中对配对状态的现场诱导调谐
Field-induced tuning of the pairing state in a superconductor
论文作者
论文摘要
最近发现的超导体UTE $ _2 $，T $ _C $在1.5〜k和2〜k之间，由于对自旋三旋转和拓扑超导性的强烈怀疑而引起了很多关注。它在磁场下的性质也很明显，具有场增强和场诱导的超导阶段。在这里，我们报告了沿着三个晶体学方向应用的磁场的相图的第一个完整的热力学测定。沿硬磁化$ b $ a轴进行测量最多36〜T，以便遵循超导过渡到$ h_ {m} = 34.75 $ 〜t的元磁过渡。它们揭示了超导相内的相变线的存在，以及这两个阶段之间发生的巨大差异。详细的分析支持这两个阶段之间的不同自旋状态，这意味着低场旋转旋转旋转旋转到高场旋转跃迁，这是超导体中独特的案例，从而深入了解了导致自旋三曲线超导性的机制。
The recently discovered superconductor UTe$_2$, with a T$_c$ between 1.5~K and 2~K, is attracting much attention due to strong suspicion of spin-triplet and topological superconductivity. Its properties under magnetic field are also remarkable, with field-reinforced and field-induced superconducting phases. Here, we report the first complete thermodynamic determination of the phase diagram for fields applied along the three crystallographic directions. Measurements were performed up to 36~T along the hard magnetisation $b$~axis in order to follow the superconducting transition up to the metamagnetic transition at $H_{m} = 34.75$~T. They reveal the existence of a phase transition line within the superconducting phase, and drastic differences occurring between these two phases. Detailed analysis supports a different spin state between the two phases, implying a low-field spin-triplet to high-field spin-singlet transition, a unique case among superconductors, giving insight on the mechanisms leading to spin-triplet superconductivity.
