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Title: Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe 2 - x T x As 2 ( T = Co , Ni )

In this paper, we use neutron diffraction and muon spin relaxation to study the effect of in-plane uniaxial pressure on the antiferromagnetic (AF) orthorhombic phase in BaFe 2As 2 and its Co- and Ni-substituted members near optimal superconductivity. In the low-temperature AF ordered state, uniaxial pressure necessary to detwin the orthorhombic crystals also increases the magnetic ordered moment, reaching an 11% increase under 40 MPa for BaFe 1.9Co 0.1As 2, and a 15% increase for BaFe 1.915Ni 0.085As 2. We also observe an increase of the AF ordering temperature (T N) of about 0.25 K/MPa in all compounds, consistent with density functional theory calculations that reveal better Fermi surface nesting for itinerant electrons under uniaxial pressure. Finally, the doping dependence of the magnetic ordered moment is captured by combining dynamical mean field theory with density functional theory, suggesting that the pressure-induced moment increase near optimal superconductivity is closely related to quantum fluctuations and the nearby electronic nematic phase.
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  1. Rice Univ., Houston, TX (United States)
  2. Columbia Univ., New York, NY (United States)
  3. Beijing Normal Univ. (China)
  4. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  5. McMaster Univ., Hamilton, ON (Canada)
  6. Zhejiang Univ., Hangzhou (China)
  7. Univ. of Tokyo (Japan)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. TRIUMF, Vancouver, BC (Canada)
  10. Inst. Laue-Langevin (ILL), Grenoble (France)
  11. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  12. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  13. Rice Univ., Houston, TX (United States); Beijing Normal Univ. (China)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; DMR-1362219; DMR-1436006; DMR-1308603; DMR-1610633; DMR-1436095; C-1839; 11674030; 2016YFA0302300
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9950
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Robert A. Welch Foundation (United States); National Natural Science Foundation of China (NNSFC); National Key Research and Development Program of China
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; antiferromagnetism; superconductivity; neutron diffraction; condensed matter & materials physics
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1344188