Dispersive x-ray absorption studies at the Fe K-edge on the iron chalcogenide superconductor FeSe under pressure

被引：11

作者：

Bendele, M. ^{[1
]}

Marini, C. ^{[2
]}

Joseph, B. ^{[1
]}

Simonelli, L. ^{[2
]}

Dore, P. ^{[1
,3
]}

Pascarelli, S. ^{[2
]}

Chikovani, M. ^{[4
]}

Pomjakushina, E. ^{[4
]}

Conder, K. ^{[4
]}

Saini, N. L. ^{[1
]}

Postorino, P. ^{[1
,5
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] Univ Roma La Sapienza, CNR SPIN, I-00185 Rome, Italy

[4] Paul Scherrer Inst, Lab Dev & Methods, CH-5232 Villigen, Switzerland

[5] Univ Roma La Sapienza, CNR IOM, I-00185 Rome, Italy

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 42期

基金：

瑞士国家科学基金会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; ELECTRONIC-STRUCTURE; SPECTROSCOPY; PHASE;

D O I：

10.1088/0953-8984/25/42/425704

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The local structure and the electronic properties of FeSe under hydrostatic pressure were studied by means of dispersive x-ray absorption measurements at the Fe K-edge. The pressure dependence of the x-ray absorption near edge structure features seems to follow the behavior of the superconducting transition temperature T-c. The local structure, that has an important impact on the superconducting properties, appears to fall into two regimes: the pressure dependence of the Fe-Fe bond distance shows a clear change in the compressibility at p similar to 5 GPa; in contrast, the Fe-Se bond distance decreases continuously with increasing pressure with a lower compressibility than the Fe-Fe bond. The results suggest that the pressure dependent changes in T-c of FeSe are closely related to the changes in local structure.

引用

页数：5

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