Spin-State Crossover Model for the Magnetism of Iron Pnictides

被引：26

作者：

Chaloupka, Jiri ^{[1
,2
]}

Khaliullin, Giniyat ^{[1
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[2] Masaryk Univ, Cent European Inst Technol, CS-61137 Brno, Czech Republic

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 20期

基金：

欧盟第七框架计划;

关键词：

EXCITATIONS;

D O I：

10.1103/PhysRevLett.110.207205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose a minimal model describing magnetic behavior of Fe-based superconductors. The key ingredient of the model is a dynamical mixing of quasidegenerate spin states of Fe2+ ion by intersite electron hoppings, resulting in an effective local spin S-eff. The moments S-eff tend to form singlet pairs and may condense into a spin nematic phase due to the emergent biquadratic exchange couplings. The long-range ordered part m of S-eff varies widely, 0 <= m <= S-eff, but magnon spectra are universal and scale with S-eff, resolving the puzzle of large but fluctuating Fe moments. Unusual temperature dependences of a local moment and spin susceptibility are also explained.

引用

页数：5

共 43 条

[1] Magnetism, superconductivity, and pairing symmetry in iron-based superconductors [J].

Chubukov, A. V. ;

Efremov, D. V. ;

Eremin, I. .

PHYSICAL REVIEW B, 2008, 78 (13)

[2] 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

[3] Spinor bosonic atoms in optical lattices: Symmetry breaking and fractionalization [J].

Demler, E ;

Zhou, F .

PHYSICAL REVIEW LETTERS, 2002, 88 (16) :4

[4] 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)

[5] Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides [J].

Graser, S. ;

Maier, T. A. ;

Hirschfeld, P. J. ;

Scalapino, D. J. .

NEW JOURNAL OF PHYSICS, 2009, 11

[6] Spin-State Transition in the Fe Pnictides [J].

Gretarsson, H. ;

Saha, S. R. ;

Drye, T. ;

Paglione, J. ;

Kim, Jungho ;

Casa, D. ;

Gog, T. ;

Wu, W. ;

Julian, S. R. ;

Kim, Young-June .

PHYSICAL REVIEW LETTERS, 2013, 110 (04)

[7] Revealing the dual nature of magnetism in iron pnictides and iron chalcogenides using x-ray emission spectroscopy [J].

Gretarsson, H. ;

Lupascu, A. ;

Kim, Jungho ;

Casa, D. ;

Gog, T. ;

Wu, W. ;

Julian, S. R. ;

Xu, Z. J. ;

Wen, J. S. ;

Gu, G. D. ;

Yuan, R. H. ;

Chen, Z. G. ;

Wang, N. -L. ;

Khim, S. ;

Kim, K. H. ;

Ishikado, M. ;

Jarrige, I. ;

Shamoto, S. ;

Chu, J. -H. ;

Fisher, I. R. ;

Kim, Young-June .

PHYSICAL REVIEW B, 2011, 84 (10)

[8] Spin crossover -: An overall perspective [J].

Gütlich, P ;

Goodwin, HA .

SPIN CROSSOVER IN TRANSITION METAL COMPOUNDS I, 2004, 233 :1-47

[9] Quadrupolar order in isotropic Heisenberg models with biquadratic interaction [J].

Harada, K ;

Kawashima, N .

PHYSICAL REVIEW B, 2002, 65 (05) :1-4

[10] Spin-exchange interactions of spin-one bosons in optical lattices: Singlet, nematic, and dimerized phases [J].

Imambekov, A ;

Lukin, M ;

Demler, E .

PHYSICAL REVIEW A, 2003, 68 (06) :24

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