Why Does Undoped FeSe Become a High-Tc Superconductor under Pressure?

被引：370

作者：

Imai, T. ^{[1
,2
]}

Ahilan, K. ^{[1
]}

Ning, F. L. ^{[1
]}

McQueen, T. M. ^{[3
]}

Cava, R. J. ^{[3
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.102.177005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Unlike the parent phases of the iron-arsenide high-T-c superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with T-c similar to 9 K. Equally surprising is the fact that applied pressure dramatically enhances the modest T-c to similar to 37 K. We investigate the electronic properties of FeSe using Se-77 NMR to search for the key to the superconducting mechanism. We demonstrate that the electronic properties of FeSe are very similar to those of electron-doped FeAs superconductors, and that antiferromagnetic spin fluctuations are strongly enhanced near T-c. Furthermore, applied pressure enhances spin fluctuations. Our findings suggest a link between spin fluctuations and the superconducting mechanism in FeSe.

引用

页数：4

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