Spin dynamics and orbital-antiphase pairing symmetry in iron-based superconductors

Yin, Z. Ping; Haule, K.; Kotliar, G.

doi:10.1038/nphys3116

Title: Spin dynamics and orbital-antiphase pairing symmetry in iron-based superconductors

Journal Article · Sun Oct 12 00:00:00 EDT 2014 · Nature Physics

DOI:https://doi.org/10.1038/nphys3116· OSTI ID:1565329

Yin, Z. Ping ^[1]; Haule, K. ^[1]; Kotliar, G. ^[1]

Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy

The symmetry of the wave function describing the Cooper pairs is one of the most basic quantities in a superconductor yet its measurement in the iron-based superconductors has proved to be very difficult. The complex multi-band nature of these materials makes the interplay of superconductivity with spin and orbital dynamics very intriguing, leading to very material dependent magnetic excitations, and pairing symmetries. In this work we use first-principles many-body method, including ab initio determined two-particle vertex function, to study the spin dynamics and superconducting pairing symmetry in a large number of iron-based superconductors. In iron compounds with high transition temperature, we find both the dispersive high-energy spin excitations, and very strong low energy commensurate or nearly commensurate spin response, suggesting that these low energy spin excitations play the dominate role in cooper pairing. We discover three closely competing types of pairing symmetries, which take a very simple form in the space of active iron 3d orbitals, and differ only in the relative quantum mechanical phase of the xz, yz and xy orbital contributions. The extensively discussed s^+- symmetry appears when contributions from all orbitals have equal sign, while the opposite sign in xz and yz orbitals leads to the d wave symmetry. A novel orbital antiphase s^+- symmetry emerges when xy orbital has opposite sign to xz and yz orbitals. We propose that this orbital-antiphase pairing symmetry explains the puzzling variation of the experimentally observed superconducting gaps on all the Fermi surfaces of LiFeAs. This novel symmetry of the order parameter may be realized in other iron superconductors.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; DMR–1308141; DMR–1405303

OSTI ID:: 1565329

Journal Information:: Nature Physics, Vol. 10, Issue 11; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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