First-order magnetic and structural phase transitions in Fe1+ySexTe1-x

被引：473

作者：

Li, Shiliang ^{[1
]}

de la Cruz, Clarina ^{[1
,2
]}

Huang, Q. ^{[3
]}

Chen, Y. ^{[3
]}

Lynn, J. W. ^{[3
]}

Hu, Jiangping ^{[4
]}

Huang, Yi-Lin ^{[5
]}

Hsu, Fong-Chi ^{[5
]}

Yeh, Kuo-Wei ^{[5
]}

Wu, Maw-Kuen ^{[5
]}

Dai, Pengcheng ^{[1
,2
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

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

[4] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

[5] Acad Sinica, Inst Phys, Taipei, Taiwan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 05期

基金：

美国国家科学基金会;

关键词：

SUPERCONDUCTIVITY; DIAGRAM; SYSTEMS; FE2TE3; METAL; TE;

D O I：

10.1103/PhysRevB.79.054503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use bulk magnetic susceptibility, electronic specific heat, and neutron scattering to study structural and magnetic phase transitions in Fe1+ySexTe1-x. Fe1.068Te exhibits a first-order phase transition near 67 K with a tetragonal-to-monoclinic structural transition and simultaneously develops a collinear antiferromagnetic (AF) order responsible for the entropy change across the transition. Systematic studies of the FeSe1-xTex system reveal that the AF structure and lattice distortion in these materials are different from those of FeAs-based pnictides. These results call into question the conclusions of present density-functional calculations, where FeSe1-xTex and FeAs-based pnictides are expected to have similar Fermi surfaces and therefore the same spin-density wave AF order.

引用

页数：7

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