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Title: Spin excitations in optimally P-doped BaFe 2 ( As 0.7 P 0.3 ) 2 superconductor

Abstract

We use inelastic neutron scattering to study temperature and energy dependence of spin excitations in optimally P-doped BaFe 2(As 0:7P 0:3) 2 superconductor (T c = 30 K) throughout the Brillouin zone. In the undoped state, spin waves and paramagnetic spin excitations of BaFe 2As 2 stem from antiferromagnetic (AF) ordering wave vector QAF = ( 1; 0) and peaks near zone boundary at ( 1; 1) around 180 meV. Replacing 30% As by smaller P to induce superconductivity, low-energy spin excitations of BaFe 2(As 0:7P 0:3) 2 form a resonance in the superconducting state and high-energy spin excitations now peaks around 220 meV near ( 1; 1). These results are consistent with calculations from a combined density functional theory and dynamical mean field theory, and suggest that the decreased average pnictogen height in BaFe 2(As 0:7P 0:3) 2 reduces the strength of electron correlations and increases the effective bandwidth of magnetic excitations.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [3];  [3];  [3];  [8];  [3];  [3];  [9];  [10]
  1. Rutgers Univ., Piscataway, NJ (United States); Beijing Normal Univ. (China)
  2. Beijing Normal Univ. (China); Rutgers Univ., Piscataway, NJ (United States)
  3. Rutgers Univ., Piscataway, NJ (United States)
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  5. Research Center for Neutron Science and Technology, Tokai (Japan)
  6. J-PARC Center, Tokai (Japan)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  8. Rutgers Univ., Piscataway, NJ (United States); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  9. Rutgers Univ., Piscataway, NJ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  10. Beijing Normal Univ. (China); Rice Univ., Houston, TX (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412752
Alternate Identifier(s):
OSTI ID: 1315860
Report Number(s):
BNL-114717-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PM051; KC0213010; TRN: US1800344
Grant/Contract Number:  
SC0012704; SC0012311
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Hu, Ding, Yin, Zhiping, Zhang, Wenliang, Ewings, R. A., Ikeuchi, Kazuhiko, Nakamura, Mitsutaka, Roessli, Bertrand, Wei, Yuan, Zhao, Lingxiao, Chen, Genfu, Li, Shiliang, Luo, Huiqian, Haule, Kristjan, Kotliar, Gabriel, and Dai, Pengcheng. Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.094504.
Hu, Ding, Yin, Zhiping, Zhang, Wenliang, Ewings, R. A., Ikeuchi, Kazuhiko, Nakamura, Mitsutaka, Roessli, Bertrand, Wei, Yuan, Zhao, Lingxiao, Chen, Genfu, Li, Shiliang, Luo, Huiqian, Haule, Kristjan, Kotliar, Gabriel, & Dai, Pengcheng. Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor. United States. doi:10.1103/PhysRevB.94.094504.
Hu, Ding, Yin, Zhiping, Zhang, Wenliang, Ewings, R. A., Ikeuchi, Kazuhiko, Nakamura, Mitsutaka, Roessli, Bertrand, Wei, Yuan, Zhao, Lingxiao, Chen, Genfu, Li, Shiliang, Luo, Huiqian, Haule, Kristjan, Kotliar, Gabriel, and Dai, Pengcheng. Fri . "Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor". United States. doi:10.1103/PhysRevB.94.094504. https://www.osti.gov/servlets/purl/1412752.
@article{osti_1412752,
title = {Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor},
author = {Hu, Ding and Yin, Zhiping and Zhang, Wenliang and Ewings, R. A. and Ikeuchi, Kazuhiko and Nakamura, Mitsutaka and Roessli, Bertrand and Wei, Yuan and Zhao, Lingxiao and Chen, Genfu and Li, Shiliang and Luo, Huiqian and Haule, Kristjan and Kotliar, Gabriel and Dai, Pengcheng},
abstractNote = {We use inelastic neutron scattering to study temperature and energy dependence of spin excitations in optimally P-doped BaFe2(As0:7P0:3)2 superconductor (Tc = 30 K) throughout the Brillouin zone. In the undoped state, spin waves and paramagnetic spin excitations of BaFe2As2 stem from antiferromagnetic (AF) ordering wave vector QAF = ( 1; 0) and peaks near zone boundary at ( 1; 1) around 180 meV. Replacing 30% As by smaller P to induce superconductivity, low-energy spin excitations of BaFe2(As0:7P0:3)2 form a resonance in the superconducting state and high-energy spin excitations now peaks around 220 meV near ( 1; 1). These results are consistent with calculations from a combined density functional theory and dynamical mean field theory, and suggest that the decreased average pnictogen height in BaFe2(As0:7P0:3)2 reduces the strength of electron correlations and increases the effective bandwidth of magnetic excitations.},
doi = {10.1103/PhysRevB.94.094504},
journal = {Physical Review B},
number = 9,
volume = 94,
place = {United States},
year = {2016},
month = {9}
}

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