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

S. H. Lee, Guangyong Xu, W. Ku, J. S. Wen, C. C. Lee, N. Katayama, Z. J. Xu, S. Ji, Z. W. Lin, G. D. Gu, H. B. Yang, P. D. Johnson, Z. H. Pan, T. Valla, M. Fujita, T. J. Sato, S. Chang, K. Yamada, J. M. Tranquada

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

We present a combined analysis of neutron scattering and photoemission measurements on superconducting FeSe0.5 Te0.5. 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.

Original languageEnglish
Article number220502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number22
DOIs
Publication statusPublished - 2010 Jun 14

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Coupling of spin and orbital excitations in the iron-based superconductor FeSe<sub>0.5</sub> Te<sub>0.5</sub>'. Together they form a unique fingerprint.

  • Cite this

    Lee, S. H., Xu, G., Ku, W., Wen, J. S., Lee, C. C., Katayama, N., Xu, Z. J., Ji, S., Lin, Z. W., Gu, G. D., Yang, H. B., Johnson, P. D., Pan, Z. H., Valla, T., Fujita, M., Sato, T. J., Chang, S., Yamada, K., & Tranquada, J. M. (2010). Coupling of spin and orbital excitations in the iron-based superconductor FeSe0.5 Te0.5. Physical Review B - Condensed Matter and Materials Physics, 81(22), [220502]. https://doi.org/10.1103/PhysRevB.81.220502