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Title: Magnetic structure and magnetoelectric properties of the spin-flop phase in LiFePO4

Journal Article · · Physical Review. B
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6];  [7]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10];  [1]; ORCiD logo [2]; ORCiD logo [11]
  1. Technical Univ. of Denmark, Lyngby (Denmark)
  2. Tohoku Univ., Sendai (Japan). Inst. for Materials Research
  3. Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
  4. Tohoku Univ., Sendai (Japan). Inst. for Materials Research; Okayama Univ. (Japan). Research Institute for Interdisciplinary Science
  5. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  6. Technical Univ. of Denmark, Lyngby (Denmark); Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
  7. Paul Scherrer Inst., Villigen (Switzerland). Lab. for Neutron Scattering and Imaging
  8. Technical Univ. of Denmark, Lyngby (Denmark); Inst. Laue-Langevin (ILL), Grenoble (France)
  9. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  10. Japan Proton Accelerator Research Complex (J-PARC) Center, Tokai (Japan)
  11. Technical Univ. of Denmark, Lyngby (Denmark); European Spallation Source (ESS), Lund (Sweden)
+ Show Author Affiliations

We investigate the magnetic structure and magnetoelectric(ME) effect in the high-field phase of the antiferromagnet LiFePO4 above the critical field of 31 T. A neutron diffraction study in pulsed magnetic fields reveals the propagation vector to be q = 0 for the high-field magnetic structure. Pulsed-field electric polarization measurements show that, at the critical field, the low-field off-diagonal ME coupling αab is partially suppressed, and the diagonal element αbb emerges. These results are consistent with a spin-flop transition where the spin direction changes from primarily being along the easy b axis below the transition to being along a above. The persistence of off-diagonal ME tensor elements above the critical field suggests a lowering of the magnetic point-group symmetry and hence a more complex magnetic structure in the high-field phase. In addition, neutron diffraction measurements in low magnetic fields show no observable field-induced spin canting, which indicates a negligible Dzyaloshinskii-Moriya interaction. The observed spin-flop field supports the Hamiltonian recently deduced from inelastic neutron studies and indicates that the system is less frustrated and with a larger single-ion anisotropy than originally thought. Our results demonstrate the effectiveness of combining pulsed-field neutron diffraction and electric polarization measurements to elucidate the magnetic structures and symmetries at the highest attainable field strengths.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
2349080
Alternate ID(s):
OSTI ID: 2356966
Report Number(s):
IS-J--11,330
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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