Enhanced triplet superconductivity in next generation ultraclean UTe2
Enhanced triplet superconductivity in next generation ultraclean UTe2
复制标题
下一代超净 UTe2 增强三线态超导性
DOI：
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
A. Eaton
中科院分区：
文献类型：
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作者：
Z. Wu;T. I. Weinberger;J. Chen;A. Cabala;D. Chichinadze;D. Shaffer;J. Pospíšil;J. Prokleška;T. Haidamak;G. Bastien;V. Sechovský;A. Hickey;M. J. Mancera;S. Benjamin;D. Graf;Y. Skourski;G. Lonzarich;M. Vališka;F. Grosche;A. Eaton
自旋三重态超导体 UTe$_2$ 表现出无数奇异的物理现象，包括在环境压力下，磁场 $mu_0 H leq$ 40~T 在某些方向上排列时拥有三个不同的超导相。然而，对不同质量的 UTe$_2$ 样本进行的研究之间的相互矛盾的报告严重阻碍了理解这种材料的微观特性的理论努力。在这里，我们报告了通过盐通量技术生长的新一代超净 UTe$_2$ 晶体的高磁场测量结果，与前几代样品相比，该晶体具有增强的超导临界温度和磁场。值得注意的是，对于靠近硬磁 $b$ 方向应用的 $H$，我们发现这些原始质量晶体中磁场增强超导性的角度范围显着增加。这表明，在接近场诱发的变磁转变时，磁涨落的增强作用（受到无序的强烈抑制）可能是在两个不同的自旋三重态超导相之间调节 UTe$_2$ 的原因。我们的结果揭示了 UTe$_2$ 场增强超导态的晶体无序具有很强的敏感性。
The spin-triplet superconductor UTe$_2$ exhibits a myriad of exotic physical phenomena, including the possession of three distinct superconducting phases at ambient pressure for magnetic field $mu_0 H leq$ 40~T aligned in certain orientations. However, contradictory reports between studies performed on UTe$_2$ specimens of varying quality have severely impeded theoretical efforts to understand the microscopic properties of this material. Here, we report high magnetic field measurements on a new generation of ultraclean UTe$_2$ crystals grown by a salt flux technique, which possess enhanced superconducting critical temperatures and fields compared to previous sample generations. Remarkably, for $H$ applied close to the hard magnetic $b$ direction, we find that the angular extent of magnetic field-reinforced superconductivity is significantly increased in these pristine quality crystals. This suggests that in close proximity to a field-induced metamagnetic transition the enhanced role of magnetic fluctuations - that are strongly suppressed by disorder - is likely responsible for tuning UTe$_2$ between two distinct spin-triplet superconducting phases. Our results reveal a strong sensitivity to crystalline disorder of the field-reinforced superconducting state of UTe$_2$.
影响因子：
5.7
作者：
Lin, Wen-Chen;Campbell, Daniel J.;Paglione, Johnpierre
通讯作者：
Paglione, Johnpierre