Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering

被引：319

作者：

Kreyssig, A. ^{[1
,2
]}

Green, M. A. ^{[3
,4
]}

Lee, Y. ^{[1
,2
]}

Samolyuk, G. D. ^{[1
,2
]}

Zajdel, P. ^{[3
,5
]}

Lynn, J. W. ^{[3
]}

Bud'ko, S. L. ^{[1
,2
]}

Torikachvili, M. S. ^{[6
]}

Ni, N. ^{[1
,2
]}

Nandi, S. ^{[1
,2
]}

Leao, J. B. ^{[3
]}

Poulton, S. J. ^{[3
,4
]}

Argyriou, D. N. ^{[7
]}

Harmon, B. N. ^{[1
,2
]}

McQueeney, R. J. ^{[1
,2
]}

Canfield, P. C. ^{[1
,2
]}

Goldman, A. I. ^{[1
,2
]}

机构：

[1] US DOE, Ames Lab, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] UCL, Dept Chem, London W1X 0AJ, England

[6] San Diego State Univ, Dept Phys, San Diego, CA 92182 USA

[7] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 18期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.78.184517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent investigations of the superconducting iron-arsenide families have highlighted the role of pressure, be it chemical or mechanical, in fostering superconductivity. Here we report that CaFe2As2 undergoes a pressure-induced transition to a nonmagnetic volume "collapsed" tetragonal phase, which becomes superconducting at lower temperature. Spin-polarized total-energy calculations on the collapsed structure reveal that the magnetic Fe moment itself collapses, consistent with the absence of magnetic order in neutron diffraction.

引用

页数：6

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