On the compressibility of BaFe2AS2

被引：16

作者：

Jorgensen, J. -E. ^{[1
]}

Olsen, J. Staun ^{[2
]}

Gerward, L. ^{[3
]}

机构：

[1] Univ Aarhus, Dept Chem, DK-8000 Aarhus C, Denmark

[2] Niels Bohr Inst, Oersted Lab, DK-2100 Copenhagen, Denmark

[3] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

来源：

SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 29-30期

关键词：

Superconductors; X-ray scattering; High pressure; SUPERCONDUCTIVITY;

D O I：

10.1016/j.ssc.2009.05.026

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

BaFe(2)AS(2) has been studied by high-pressure energy dispersive X-ray diffraction. The compression mechanism was found to be highly anisotropic, and a tetragonal to orthorhombic phase transition was observed at about 17 GPa. The length of the a- and c-axes of the tetragonal phase is reduced by 2 and 11%, respectively, at the transition pressure. Furthermore, an increase in compressibility was observed at about 1 GPa. The zero-pressure bulk modulus was determined to be B-0 = 71(4) GPa using experimental data points in the pressure range from 1 to 16.5 GPa. The experimental results are supported by electronic structure calculations within the extended Huckel approximation. (C) 2009 Elsevier Ltd. All rights reserved.

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页码：1161 / 1163

页数：3

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