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Title: Strong ferromagnetic exchange interaction under ambient pressure in BaFe 2 S 3

Inelastic neutron scattering measurements have been performed to investigate the spin waves of the quasi-one-dimensional antiferromagnetic ladder compound BaFe 2 S 3 , where a superconducting transition was observed under pressure [H. Takahashi et al., Nat. Mater. 14, 1008 (2015); T. Yamauchi et al., Phys. Rev. Lett. 115, 246402 (2015)]. By fitting the spherically averaged experimental data collected on a powder sample to a Heisenberg Hamiltonian, we find that the one-dimensional antiferromagnetic ladder exhibits a strong nearest-neighbor ferromagnetic exchange interaction (SJ R = - 71 ± 4 meV) along the rung direction, an antiferromagnetic SJ L = 49 ± 3 meV along the leg direction, and a ferromagnetic SJ 2 = - 15 ± 2 meV along the diagonal direction. Finally, our data demonstrate that the antiferromagnetic spin excitations are a common characteristic for the iron-based superconductors, while specific relative values for the exchange interactions do not appear to be unique for the parent states of the superconducting materials.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [8] ;  [9] ;  [10] ;  [2] ;  [11]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Sun Yat-Sen Univ., Guangzhou, (China). School of Physics
  2. Sun Yat-Sen Univ., Guangzhou, (China). School of Physics
  3. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  4. Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  6. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
  7. Chinese Academy of Sciences (CAS), Beijing (China). Beijing Synchrotron Radiation Facility, Inst. of High Energy Physics
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
  10. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
  11. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; AC03-76SF008; AC02-05-CH11231; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1353167
Alternate Identifier(s):
OSTI ID: 1342610; OSTI ID: 1435341