Superconductivity and magnetic fluctuations developing in the vicinity of strong first-order magnetic transition in CrAs

被引：9

作者：

Kotegawa, H. ^{[1
]}

Matsushima, K. ^{[1
]}

Nakahara, S. ^{[1
]}

Tou, H. ^{[1
]}

Kaneyoshi, J. ^{[1
]}

Nishiwaki, T. ^{[1
]}

Matsuoka, E. ^{[1
]}

Sugawara, H. ^{[1
]}

Harima, H. ^{[1
]}

机构：

[1] Kobe Univ, Dept Phys, Kobe, Hyogo 6578501, Japan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2017年 / 29卷 / 23期

关键词：

CrAs; superconductivity; pressure; SINGLE-CRYSTAL; ORDER;

D O I：

10.1088/1361-648X/aa6e7d

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report single crystal preparation, resistivity, and nuclear quadrupole resonance (NQR) measurements for new pressure-induced superconductor CrAs. In the first part, we present the difference between crystals made by different thermal sequences and methods, and show the sample dependence of superconductivity in CrAs. In the latter part, we show NQR data focusing the microscopic electronic state at the phase boundary between the helimagnetic and the paramagnetic phases. They suggest strongly that a quantum critical point is absent on the pressure-temperature phase diagram of CrAs, because of the strong first-order character of the magnetic transition; however, the spin fluctuations are observed in the paramagnetic phase. The close relationship between the spin fluctuations and superconductivity can be seen even in the vicinity of the first-order magnetic transition in CrAs.

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页数：6

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