Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe1-xCoxAs

Li, Yu; Yin, Zhiping; Wang, Xiancheng; Tam, David W.; Abernathy, D. L.; Podlesnyak, A.; Zhang, Chenglin; Wang, Meng; Xing, Lingyi; Jin, Changqing; Haule, Kristjan; Kotliar, Gabriel; Maier, Thomas A.; Dai, Pengcheng

doi:10.1103/PhysRevLett.116.247001

Title: Orbital Selective Spin Excitations and their Impact on Superconductivity of ${LiFe}_{1 - x} {Co}_{x} As$

Journal Article · Fri Jun 17 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.247001· OSTI ID:1412753

Li, Yu ^[1]; Yin, Zhiping ^[2]; Wang, Xiancheng ^[3]; Tam, David W. ^[1]; Abernathy, D. L. ^[4]; Podlesnyak, A. ^[4]; Zhang, Chenglin ^[1]; Wang, Meng ^[5]; Xing, Lingyi ^[3]; Jin, Changqing ^[6]; Haule, Kristjan ^[7]; Kotliar, Gabriel ^[8]; Maier, Thomas A. ^[4]; Dai, Pengcheng ^[9]

Rice Univ., Houston, TX (United States)
Beijing Normal Univ. (China); Rutgers Univ., Piscataway, NJ (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, Berkeley, CA (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Rutgers Univ., Piscataway, NJ (United States)
Rutgers Univ., Piscataway, NJ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Rice Univ., Houston, TX (United States); Beijing Normal Univ. (China)

We use neutron scattering to study spin excitations in single crystals of LiFe_0.88Co_0.12As, which is located near the boundary of the superconducting phase of LiFe_1-xCo_xAs and exhibits non- Fermi-liquid behavior indicative of a quantum critical point. By comparing spin excitations of LiFe_0.88Co_0.12As with a combined density functional theory (DFT) and dynamical mean field theory (DMFT) calculation, we conclude that wave-vector correlated low energy spin excitations are mostly from the dxy orbitals, while high-energy spin excitations arise from the dyz and dxz orbitals. Unlike most iron pnictides, the strong orbital selective spin excitations in LiFeAs family cannot be described by anisotropic Heisenberg Hamiltonian. While the evolution of low-energy spin excitations of LiFe_1-xCo_xAs are consistent with electron-hole Fermi surface nesting condition for the dxy orbital, the reduced superconductivity in LiFe_0.88Co_0.12As suggests that Fermi surface nesting conditions for the dyz and dxz orbitals are also important for superconductivity in iron pnictides.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; SC0012311; AC05-00OR22725

OSTI ID:: 1412753

Alternate ID(s):: OSTI ID: 1257667

Report Number(s):: BNL-114720-2017-JA; PRLTAO; R&D Project: PM051; KC0213010; TRN: US1800345

Journal Information:: Physical Review Letters, Vol. 116, Issue 24; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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