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arXiv 1302.4787cond-mat.supr-concond-mat.dis-nncond-mat.mtrl-sci
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强内禀无序三维超导体AgSnSe2上临界场以上的反常金属态

Anomalous metallic state above the upper critical field of the conventional three-dimensional superconductor AgSnSe2 with strong intrinsic disorder

Zhi Ren, M. Kriener, A. A. Taskin, Satoshi Sasaki, Kouji Segawa, Yoichi Ando

摘要:

我们报告的超导性质的AgSnSe 2,这是一个传统的II型超导体在非常脏的限制,由于固有的强电子散射。虽然这种材料是一种各向同性的三维(3D)超导体,具有不那么短的相干长度,在这种情况下,预计不会出现强烈的涡旋波动,但我们发现,在固定温度下,磁场诱导的电阻转变在零温度下变得越来越宽,令人惊讶的是,这种加宽的转变在很大程度上发生在由比热确定的上临界场之上。这一结果表明,在强无序的三维超导体中存在着可能由量子相位涨落引起的反常金属态。

英文摘要:

We report superconducting properties of AgSnSe2 which is a conventional type-II superconductor in the very dirty limit due to intrinsically strong electron scatterings. While this material is an isotropic three-dimensional (3D) superconductor with a not-so-short coherence length where strong vortex fluctuations are NOT expected, we found that the magnetic-field-induced resistive transition at fixed temperatures becomes increasingly broader toward zero temperature and, surprisingly, that this broadened transition is taking place largely ABOVE the upper critical field determined thermodynamically from the specific heat. This result points to the existence of an anomalous metallic state possibly caused by quantum phase fluctuations in a strongly-disordered 3D superconductor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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