Pressure-induced superconducting state of antiferromagnetic CaFe2As2

被引：65

作者：

Lee, Hanoh ^{[1
]}

Park, Eunsung ^{[2
]}

Park, Tuson ^{[1
,2
]}

Sidorov, V. A. ^{[3
]}

Ronning, F. ^{[1
]}

Bauer, E. D. ^{[1
]}

Thompson, J. D. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea

[3] Vereshchagin Inst High Pressure Phys, Troitsk 142190, Russia

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 02期

基金：

俄罗斯基础研究基金会;

关键词：

antiferromagnetic materials; calcium compounds; electrical resistivity; fluctuations in superconductors; iron compounds; magnetic susceptibility; type II superconductors; LAYERED QUATERNARY COMPOUND;

D O I：

10.1103/PhysRevB.80.024519

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The antiferromagnet CaFe2As2 does not become superconducting when subject to ideal hydrostatic pressure conditions, where crystallographic and magnetic states also are well defined. By measuring electrical resistivity and magnetic susceptibility under quasihydrostatic pressure, however, we find that a substantial volume fraction of the sample is superconducting in a narrow pressure range where collapsed tetragonal and orthorhombic structures coexist. At higher pressures, the collapsed tetragonal structure is stabilized with the boundary between this structure and the phase of coexisting structures strongly dependent on pressure history. Fluctuations in magnetic degrees of freedom in the phase of coexisting structures appear to be important for superconductivity.

引用

页数：6

共 43 条

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