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.
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收藏
页数：5
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