Detection of an Unconventional Superconducting Phase in the Vicinity of the Strong First-Order Magnetic Transition in CrAs Using 75As-Nuclear Quadrupole Resonance

被引：52

作者：

Kotegawa, Hisashi ^{[1
]}

Nakahara, Shingo ^{[1
]}

Akamatsu, Rui ^{[1
]}

Tou, Hideki ^{[1
]}

Sugawara, Hitoshi ^{[1
]}

Harima, Hisatomo ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 11期

关键词：

First order transitions - First-order magnetic transition - Nuclear spin lattice relaxation rate - Pressure induced superconductivity - Quantum critical points - Superconducting phase - Superconducting state - Unconventional superconductors;

D O I：

10.1103/PhysRevLett.114.117002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Pressure-induced superconductivity was recently discovered in the binary helimagnet CrAs. We report the results of measurements of nuclear quadrupole resonance for CrAs under pressure. In the vicinity of the critical pressure Pc between the helimagnetic (HM) and paramagnetic (PM) phases, a phase separation is observed. The large internal field remaining in the phase-separated HM state indicates that the HM phase disappears through a strong first-order transition. This indicates the absence of a quantum critical point in CrAs; however, the nuclear spin-lattice relaxation rate 1= T-1 reveals that substantial magnetic fluctuations are present in the PM state. The absence of a coherence effect in 1= T-1 in the superconducting state provides evidence that CrAs is the first Cr-based unconventional superconductor.

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页数：5

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