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Title: Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO 4

We report significant details of the magnetic structure and spin dynamics of LiFePO 4 obtained by single-crystal neutron scattering. Our results confirm a previously reported collinear rotation of the spins away from the principal b axis, and they determine that the rotation is toward the a axis. In addition, we find a significant spin-canting component along c. Furthermore, the possible causes of these components are discussed, and their significance for the magnetoelectric effect is analyzed. Inelastic neutron scattering along the three principal directions reveals a highly anisotropic hard plane consistent with earlier susceptibility measurements. While using a spin Hamiltonian, we show that the spin dimensionality is intermediate between XY- and Ising-like, with an easy b axis and a hard c axis. As a result, it is shown that both next-nearest neighbor exchange couplings in the bc plane are in competition with the strongest nearest neighbor coupling.
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [7] ;  [3]
  1. Helmholtz Zentrum Berlin Fur Materialien und Energie, Berlin (Germany)
  2. Technical Univ. of Denmark, Lyngby (Denmark)
  3. Iowa State Univ., Ames, IA (United States)
  4. Helmholtz Zentrum Berlin Fur Materialien und Energie, Berlin (Germany); Institute for Basic Science (IBS), Seoul (Korea)
  5. Technical Univ. of Denmark, Lyngby (Denmark); Paul Scherrer Institut, Villigen (Switzerland); Univ. of Birmingham, Birmingham (United Kingdom)
  6. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  7. Univ. of Copenhagen (Denmark)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
DANSCATT; PP002-102831; AC02-07CH11358
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 1098-0121
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States