强磁场提高超导临界温度。

Superconducting critical temperature elevated by intense magnetic fields.

作者信息

Wu Z, Chen H, Weinberger T I, Cabala A, Graf D E, Skourski Y, Xie W, Ling Y, Zhu Z, Sechovský V, Vališka M, Grosche F M, Eaton A G

机构信息

Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom.

Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Charles University, Prague 2 121 16, Czech Republic.

出版信息

Proc Natl Acad Sci U S A. 2025 Jan 14;122(2):e2422156122. doi: 10.1073/pnas.2422156122. Epub 2025 Jan 8.

DOI:10.1073/pnas.2422156122

PMID:39773022

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11745342/

Abstract

Below a critical temperature [Formula: see text], superconductors transport electrical charge without dissipative energy losses. The application of a magnetic field [Formula: see text] generally acts to suppress [Formula: see text], up to some critical field strength at which [Formula: see text] 0 K. Here, we investigate magnetic field-induced superconductivity in high-quality specimens of the triplet superconductor candidate UTe[Formula: see text] in pulsed magnetic fields up to [Formula: see text] [Formula: see text] 70 T. Strikingly, we find that this material has a higher [Formula: see text] when [Formula: see text] 40 T ([Formula: see text] 2.4 K) than it does for [Formula: see text] 0 T ([Formula: see text] 2.1 K). This observation points to a fundamentally distinct mechanism for the formation of superconductivity at high [Formula: see text] in UTe[Formula: see text] compared to the case of [Formula: see text] [Formula: see text] 0 T.

摘要

在低于临界温度[公式：见正文]时，超导体传输电荷而无能量耗散损失。施加磁场[公式：见正文]通常会起到抑制[公式：见正文]的作用，直至达到某个临界场强，此时[公式：见正文]为0 K。在此，我们研究了三重态超导候选物UTe[公式：见正文]的高质量样品在高达[公式：见正文][公式：见正文]70 T的脉冲磁场中的磁场诱导超导性。令人惊讶的是，我们发现当[公式：见正文]为40 T（[公式：见正文]2.4 K）时，这种材料的[公式：见正文]比[公式：见正文]为0 T（[公式：见正文]2.1 K）时更高。这一观察结果表明，与[公式：见正文][公式：见正文]为0 T的情况相比，UTe[公式：见正文]中高[公式：见正文]时超导形成的机制存在根本差异。