Tetragonal-to-Orthorhombic Structural Phase Transition at 90 K in the Superconductor Fe1.01Se

被引：447

作者：

McQueen, T. M. ^{[1
]}

Williams, A. J. ^{[1
]}

Stephens, P. W. ^{[2
]}

Tao, J. ^{[3
]}

Zhu, Y. ^{[3
]}

Ksenofontov, V. ^{[4
]}

Casper, F. ^{[4
]}

Felser, C. ^{[4
]}

Cava, R. J. ^{[1
]}

机构：

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

[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[3] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[4] Johannes Gutenberg Univ Mainz, Inst Anorgan Chem & Analyt Chem, D-55099 Mainz, Germany

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 05期

关键词：

IRON; SMFEASO1-XFX; DIAGRAM; ORDER; FESE;

D O I：

10.1103/PhysRevLett.103.057002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter we show that superconducting Fe1.01Se undergoes a structural transition at 90 K from a tetragonal to an orthorhombic phase but that nonsuperconducting Fe1.03Se does not. High resolution electron microscopy at low temperatures further reveals an unexpected additional modulation of the crystal structure of the superconducting phase that involves displacements of the Fe atoms, and that the nonsuperconducting composition shows a different, complex nanometer-scale structural modulation. Finally, we show that magnetism is not the driving force for the phase transition in the superconducting phase.

引用

页数：4

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