Local atomic and magnetic structure of dilute magnetic semiconductor (Ba, K)(Zn, Mn)2As2

被引：31

作者：

Frandsen, Benjamin A. ^{[1
]}

Gong, Zizhou ^{[1
]}

Terban, Maxwell W. ^{[2
]}

Banerjee, Soham ^{[2
]}

Chen, Bijuan ^{[3
]}

Jin, Changqing ^{[3
]}

Feygenson, Mikhail ^{[4
]}

Uemura, Yasutomo J. ^{[1
]}

Billinge, Simon J. L. ^{[2
,5
]}

机构：

[1] Columbia Univ, Dept Phys, New York, NY 10027 USA

[2] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[3] Chinese Acad Sci, Inst Phys, Beijing, Peoples R China

[4] Forschungszentrum Julich GmbH, Julich Ctr Neutron Sci, D-52425 Julich, Germany

[5] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.94.094102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the atomic and magnetic structure of the dilute ferromagnetic semiconductor system (Ba, K)(Zn, Mn)(2)As-2 through atomic and magnetic pair distribution function analysis of temperature-dependent x-ray and neutron total scattering data. We detected a change in curvature of the temperature-dependent unit cell volume of the average tetragonal crystallographic structure at a temperature coinciding with the onset of ferromagnetic order. We also observed the existence of a well-defined local orthorhombic structure on a short length scale of less than or similar to 5 angstrom, resulting in a rather asymmetrical local environment of the Mn and As ions. Finally, the magnetic PDF revealed ferromagnetic alignment of Mn spins along the crystallographic c axis, with robust nearest-neighbor ferromagnetic correlations that exist even above the ferromagnetic ordering temperature. We discuss these results in the context of other experiments and theoretical studies on this system.

引用

页数：8

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