Coupling of spin and orbital excitations in the iron-based superconductor FeSe0.5Te0.5

被引：60

作者：

Lee, S. -H. ^{[1
]}

Xu, Guangyong ^{[2
]}

Ku, W. ^{[2
]}

Wen, J. S. ^{[2
,3
]}

Lee, C. C. ^{[2
]}

Katayama, N. ^{[1
]}

Xu, Z. J. ^{[2
,4
]}

Ji, S. ^{[1
]}

Lin, Z. W. ^{[2
]}

Gu, G. D. ^{[2
]}

Yang, H. -B. ^{[2
]}

Johnson, P. D. ^{[2
]}

Pan, Z. -H. ^{[2
]}

Valla, T. ^{[2
]}

Fujita, M. ^{[5
]}

Sato, T. J. ^{[6
]}

Chang, S. ^{[7
]}

Yamada, K. ^{[8
]}

Tranquada, J. M. ^{[2
]}

机构：

[1] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

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

[3] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA

[4] CUNY City Coll, Dept Phys, New York, NY 10031 USA

[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[6] Univ Tokyo, Inst Solid State Phys, Neutron Sci Lab, Ibaraki 3191106, Japan

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

[8] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 22期

基金：

美国国家科学基金会;

关键词：

STATE;

D O I：

10.1103/PhysRevB.81.220502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a combined analysis of neutron scattering and photoemission measurements on superconducting FeSe0.5Te0.5. The low-energy magnetic excitations disperse only in the direction transverse to the characteristic wave vector (1/2, 0,0) whereas the electronic Fermi surface near (1/2, 0,0) appears to consist of four incommensurate pockets. While the spin resonance occurs at an incommensurate wave vector compatible with nesting, neither spin-wave nor Fermi-surface-nesting models can describe the magnetic dispersion. We propose that a coupling of spin and orbital correlations is key to explaining this behavior. If correct, it follows that these nematic fluctuations are involved in the resonance and could be relevant to the pairing mechanism.

引用

页数：4

共 28 条

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