Anomalous magnetic structure and spin dynamics in magnetoelectric LiFePO4
- Helmholtz Zentrum Berlin Fur Materialien und Energie, Berlin (Germany)
- Technical Univ. of Denmark, Lyngby (Denmark)
- Iowa State Univ., Ames, IA (United States)
- Helmholtz Zentrum Berlin Fur Materialien und Energie, Berlin (Germany); Institute for Basic Science (IBS), Seoul (Korea)
- Technical Univ. of Denmark, Lyngby (Denmark); Paul Scherrer Institut, Villigen (Switzerland); Univ. of Birmingham, Birmingham (United Kingdom)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Univ. of Copenhagen (Denmark)
We report significant details of the magnetic structure and spin dynamics of LiFePO4 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.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- DANSCATT; PP002-102831; AC02-07CH11358
- OSTI ID:
- 1227391
- Alternate ID(s):
- OSTI ID: 1198669
- Report Number(s):
- IS-J-8744; PRBMDO
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 2; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Mössbauer Spectroscopy of Triphylite (LiFePO4) at Low Temperatures
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journal | October 2019 |
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