Orbital ordering induces structural phase transition and the resistivity anomaly in iron pnictides

被引：219

作者：

Lv, Weicheng ^{[1
]}

Wu, Jiansheng ^{[1
]}

Phillips, Philip ^{[1
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 22期

关键词：

antiferromagnetic materials; electrical resistivity; iron compounds; magnetic anisotropy; solid-state phase transformations; AMORPHOUS METALS; 2-LEVEL SYSTEM; ELECTRONS; EXCHANGE; DIAGRAM;

D O I：

10.1103/PhysRevB.80.224506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We attribute the structural phase transition (SPT) in the parent compounds of the iron pnictides to orbital ordering. Due to the anisotropy of the d(xz) and d(yz) orbitals in the xy plane, a ferro-orbital ordering makes the orthorhombic structure more energetically favorable, thus inducing the SPT. In this orbital-ordered system, the sites with orbitals that do not order have higher energies. Scattering of the itinerant electrons by these localized two-level systems causes a resistivity anomaly upon the onset of the SPT. The proposed orbital ordering also leads to stripelike antiferromagnetism and anisotropy of the magnetic exchange couplings. This model is quantitatively consistent with available experimental observations.

引用

页数：5

共 33 条

[1] Infrared phonon anomaly in BaFe2As2 [J].

Akrap, A. ;

Tu, J. J. ;

Li, L. J. ;

Cao, G. H. ;

Xu, Z. A. ;

Homes, C. C. .

PHYSICAL REVIEW B, 2009, 80 (18)

[2] CONSIDERATIONS ON DOUBLE EXCHANGE [J].

ANDERSON, PW ;

HASEGAWA, H .

PHYSICAL REVIEW, 1955, 100 (02) :675-681

[3]

DAI JH, ARXIV09012787

[4] Iron pnictides as a new setting for quantum criticality [J].

Dai, Jianhui ;

Si, Qimiao ;

Zhu, Jian-Xin ;

Abrahams, Elihu .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2009, 106 (11) :4118-4121

[5] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[6] EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].

DEGENNES, PG .

PHYSICAL REVIEW, 1960, 118 (01) :141-154

[7] Competing orders and spin-density-wave instability in La(O1-xFx) FeAs [J].

Dong, J. ;

Zhang, H. J. ;

Xu, G. ;

Li, Z. ;

Li, G. ;

Hu, W. Z. ;

Wu, D. ;

Chen, G. F. ;

Dai, X. ;

Luo, J. L. ;

Fang, Z. ;

Wang, N. L. .

EPL, 2008, 83 (02)

[8] Theory of electron nematic order in LaFeAsO [J].

Fang, Chen ;

Yao, Hong ;

Tsai, Wei-Feng ;

Hu, JiangPing ;

Kivelson, Steven A. .

PHYSICAL REVIEW B, 2008, 77 (22)

[9] Lattice and magnetic instabilities in CaFe2As2:: A single-crystal neutron diffraction study [J].

Goldman, A. I. ;

Argyriou, D. N. ;

Ouladdiaf, B. ;

Chatterji, T. ;

Kreyssig, A. ;

Nandi, S. ;

Ni, N. ;

Bud'ko, S. L. ;

Canfield, P. C. ;

McQueeney, R. J. .

PHYSICAL REVIEW B, 2008, 78 (10)

[10] Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe2As2 Compound of FeAs-Based High-Temperature Superconductors [J].

Huang, Q. ;

Qiu, Y. ;

Bao, Wei ;

Green, M. A. ;

Lynn, J. W. ;

Gasparovic, Y. C. ;

Wu, T. ;

Wu, G. ;

Chen, X. H. .

PHYSICAL REVIEW LETTERS, 2008, 101 (25)

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