Comparison of two superconducting phases induced by a magnetic field in UTe2
Comparison of two superconducting phases induced by a magnetic field in UTe2
复制标题
UTe2 中磁场感应的两个超导相的比较
DOI：
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
D. Braithwaite
中科院分区：
文献类型：
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作者：
W. Knafo;M. Nardone;M. Vališka;A. Zitouni;G. Lapertot;D. Aoki;G. Knebel;D. Braithwaite
在变磁性附近的磁场诱导的超导是磁介导超导配对的一个显著表现。在巡游铁磁体中观察到这种现象后，最近在正交顺磁体UTe 2中报道了这种现象。本文研究了两个磁场方向下的UTe 2相图：硬磁化轴B和在（B，c）平面内与B成25-30°的方向。零电阻率测量证实，超导电性是建立在倾斜磁场方向的变磁场H m以外。当超导性被精确地锁定在更小的场（对于H||B）或大于（对于从B到c倾斜Δ 27°的H），电阻率中的费米液体系数和剩余电阻率的变化在两个场方向上是相似的。两个场方向的正常态的相似性对超导性的理论模型提出了限制，并意味着某些微妙的成分必须在起作用。在磁场中，超导性可以在变磁转变附近被诱导或增强，其中铁磁波动被怀疑介导库珀对的配对强度。在这里，作者调查的超导体UTe 2和报告的超导性能的变化作为磁场施加沿着两个特定的晶轴和它们的关系到变磁性。
Superconductivity induced by a magnetic field near metamagnetism is a striking manifestation of magnetically-mediated superconducting pairing. After being observed in itinerant ferromagnets, this phenomenon was recently reported in the orthorhombic paramagnet UTe 2 . Here we explore the phase diagram of UTe 2 under two magnetic-field directions: the hard magnetization axis b , and a direction titled by ≃25-30° from b in the ( b , c ) plane. Zero-resistivity measurements confirm that superconductivity is established beyond the metamagnetic field H m in the tilted-field direction. While superconductivity is locked exactly at fields either smaller (for H | | b ), or larger (for H tilted by ≃27° from b to c ), than H m , the variations of the Fermi-liquid coefficient in the electrical resistivity and of the residual resistivity are similar for the two field directions. The resemblance of the normal states for the two field directions puts constraints for theoretical models of superconductivity and implies that some subtle ingredients must be in play. In a magnetic field, superconductivity can be induced or reinforced near a metamagnetic transition, where ferromagnetic fluctuations are suspected to mediate the pairing strength of the Cooper pairs. Here, the authors investigate the superconductor UTe 2 and report on the variation in the superconducting properties as the magnetic field is applied along two particular crystallographic axes and their relation to metamagnetism.
影响因子：
5.7
作者：
Lin, Wen-Chen;Campbell, Daniel J.;Paglione, Johnpierre
通讯作者：
Paglione, Johnpierre
影响因子：
19.6
作者：
E. Yelland;J. Barraclough;Weiwei Wang;K. Kamenev;A. Huxley
通讯作者：
E. Yelland;J. Barraclough;Weiwei Wang;K. Kamenev;A. Huxley