Coexistence of superconductivity and magnetism in FeSe1-x under pressure

被引：131

作者：

Bendele, M. ^{[1
,2
]}

Ichsanow, A. ^{[1
]}

Pashkevich, Yu. ^{[3
]}

Keller, L. ^{[4
]}

Straessle, Th. ^{[4
]}

Gusev, A. ^{[3
]}

Pomjakushina, E. ^{[5
]}

Conder, K. ^{[5
]}

Khasanov, R. ^{[2
]}

Keller, H. ^{[1
]}

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[3] AA Galkin Donetsk Phystech NASU, UA-83114 Donetsk, Ukraine

[4] Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

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

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 06期

基金：

瑞士国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.85.064517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An extended investigation of the electronic phase diagram of FeSe1-x up to pressures of p similar or equal to 2.4 GPa by means of ac and dc magnetization, zero-field muon spin rotation (ZF mu SR), and neutron diffraction is presented. ZF mu SR indicates that at pressures p >= 0.8 GPa static magnetic order occurs in FeSe1-x and occupies the full sample volume for p greater than or similar to 1.2 GPa. ac magnetization measurements reveal that the superconducting volume fraction stays close to 100% up to the highest pressure investigated. In addition, above p >= 1.2 GPa both the superconducting transition temperature T-c and the magnetic ordering temperature T-N increase simultaneously, and both superconductivity and magnetism are stabilized with increasing pressure. Calculations indicate only one possible muon stopping site in FeSe1-x, located on the line connecting the Se atoms along the c direction. Different magnetic structures are proposed and checked by combining the muon stopping calculations with a symmetry analysis, leading to a similar structure as in the LaFeAsO family of Fe-based superconductors. Furthermore, it is shown that the magnetic moment is pressure dependent and with a rather small value of mu approximate to 0.2 mu(B) at p similar or equal to 2.4 GPa.

引用

页数：11