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

Abstract

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.

Authors:
 [1];  [2];  [3];  [1];  [4];  [4];  [1];  [5];  [3];  [6];  [7];  [8];  [4];  [9]
  1. Rice Univ., Houston, TX (United States)
  2. Beijing Normal Univ. (China); Rutgers Univ., Piscataway, NJ (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  7. Rutgers Univ., Piscataway, NJ (United States)
  8. Rutgers Univ., Piscataway, NJ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  9. Rice Univ., Houston, TX (United States); Beijing Normal Univ. (China)
Publication Date:
Research Org.:
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 Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412753
Alternate Identifier(s):
OSTI ID: 1257667
Report Number(s):
BNL-114720-2017-JA
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: PM051; KC0213010; TRN: US1800345
Grant/Contract Number:  
SC0012704; SC0012311; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., and Dai, Pengcheng. Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe1-xCoxAs. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.247001.
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. Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe1-xCoxAs. United States. doi:10.1103/PhysRevLett.116.247001.
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., and Dai, Pengcheng. Fri . "Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe1-xCoxAs". United States. doi:10.1103/PhysRevLett.116.247001. https://www.osti.gov/servlets/purl/1412753.
@article{osti_1412753,
title = {Orbital Selective Spin Excitations and their Impact on Superconductivity of LiFe1-xCoxAs},
author = {Li, Yu and Yin, Zhiping and Wang, Xiancheng and Tam, David W. and Abernathy, D. L. and Podlesnyak, A. and Zhang, Chenglin and Wang, Meng and Xing, Lingyi and Jin, Changqing and Haule, Kristjan and Kotliar, Gabriel and Maier, Thomas A. and Dai, Pengcheng},
abstractNote = {We use neutron scattering to study spin excitations in single crystals of LiFe0.88Co0.12As, which is located near the boundary of the superconducting phase of LiFe1-xCoxAs and exhibits non- Fermi-liquid behavior indicative of a quantum critical point. By comparing spin excitations of LiFe0.88Co0.12As 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 LiFe1-xCoxAs are consistent with electron-hole Fermi surface nesting condition for the dxy orbital, the reduced superconductivity in LiFe0.88Co0.12As suggests that Fermi surface nesting conditions for the dyz and dxz orbitals are also important for superconductivity in iron pnictides.},
doi = {10.1103/PhysRevLett.116.247001},
journal = {Physical Review Letters},
number = 24,
volume = 116,
place = {United States},
year = {2016},
month = {6}
}

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