Pressure-induced effects on the structure of the FeSe superconductor

被引：80

作者：

Millican, Jasmine N. ^{[1
]}

Phelan, Daniel ^{[1
]}

Thomas, Evan L. ^{[2
]}

Leao, Juscelino B. ^{[1
]}

Carpenter, Elisabeth ^{[1
]}

机构：

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

[2] Natl Inst Stand & Technol, Div Ceram, Gaithersburg, MD 20899 USA

来源：

SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 17-18期

关键词：

Superconductors; Crystal structure and symmetry; Phase transitions; Neutron scattering; 43; K;

D O I：

10.1016/j.ssc.2009.02.011

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A polycrystalline sample of FeSe, which adopts the tetragonal PbO-type structure (P(4)/nmm) at room temperature, has been prepared using solid state reaction. We have investigated pressure-induced structural changes in tetragonal FeSe at varying hydrostatic pressures up to 0.6 GPa in the orthorhombic (T = 50 K) and tetragonal (T = 190 K) phases using high resolution neutron powder diffraction. We report that the structure is quite compressible with a Bulk modulus approximate to 31 GPa to 33 GPa and that the pressure response is anisotropic with a larger compressibility along the c-axis. Key bond angles of the SeFe(4) pyramids and FeSe(4) tetrahedra are also determined as a function of pressure. Published by Elsevier Ltd

引用

页码：707 / 710

页数：4

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