UCoGe中弱巡游铁磁性边界的超导性。

Superconductivity on the border of weak itinerant ferromagnetism in UCoGe.

作者信息

Huy N T, Gasparini A, de Nijs D E, Huang Y, Klaasse J C P, Gortenmulder T, de Visser A, Hamann A, Görlach T, Löhneysen H V

机构信息

Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands.

出版信息

Phys Rev Lett. 2007 Aug 10;99(6):067006. doi: 10.1103/PhysRevLett.99.067006.

DOI:10.1103/PhysRevLett.99.067006

PMID:17930860

Abstract

We report the coexistence of ferromagnetic order and superconductivity in UCoGe at ambient pressure. Magnetization measurements show that UCoGe is a weak ferromagnet with a Curie temperature T(C)=3 K and a small ordered moment m(0)=0.03 micro(B). Superconductivity is observed with a resistive transition temperature T(s)=0.8 K for the best sample. Thermal-expansion and specific-heat measurements provide solid evidence for bulk magnetism and superconductivity. The proximity to a ferromagnetic instability, the defect sensitivity of T(s), and the absence of Pauli limiting, suggest triplet superconductivity mediated by critical ferromagnetic fluctuations.

摘要

我们报道了在常压下UCoGe中同时存在铁磁序和超导性。磁化测量表明，UCoGe是一种弱铁磁体，居里温度T(C)=3 K，有序磁矩m(0)=0.03微玻尔磁子。对于最佳样品，观察到超导转变温度T(s)=0.8 K。热膨胀和比热测量为体磁和超导提供了确凿证据。接近铁磁不稳定性、T(s)对缺陷的敏感性以及不存在泡利极限，表明由临界铁磁涨落介导的三重态超导性。