Enhancement of Superconductivity near the Ferromagnetic Quantum Critical Point in UCoGe

被引：91
|
作者：
Slooten, E. [1 ]
Naka, T. [2 ]
Gasparini, A. [1 ]
Huang, Y. K. [1 ]
de Visser, A. [1 ]
机构：
[1] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands
[2] Natl Res Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 09期
关键词：
COEXISTENCE; URHGE; UGE2;
D O I：
10.1103/PhysRevLett.103.097003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report a high-pressure single crystal study of the superconducting ferromagnet UCoGe. Measurements of the ac susceptibility and resistivity under pressures up to 2.2 GPa show ferromagnetism is smoothly depressed and vanishes at a critical pressure p(c)=1.4 GPa. Near the ferromagnetic critical point superconductivity is enhanced. Upper-critical field measurements under pressure show B(c2)(0) attains remarkably large values, which provides solid evidence for spin-triplet superconductivity over the whole pressure range. The obtained p-T phase diagram reveals superconductivity is closely connected to a ferromagnetic quantum-critical point hidden under the superconducting "dome.".
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页数：4
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