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Title: Raman scattering from one and two magnons in magnetoelectric LiNiPO 4

Abstract

Polarized Raman scattering in magnetoelectric LiNiPO 4 shows a sharp resonant peak at 37 cm -1 in the magnetically ordered phase, originating from a one-magnon excitation of Ni 2+ S = 1 localized moments at the zone center. Also, a broad component with maximum intensity at ~ 65 cm -1 is observed and successfully modeled in terms of light scattering from two-magnon excitations within the framework of the Fleury-Loudon theory using five relevant exchange parameters, providing an independent experimental confirmation of their values previously obtained with inelastic neutron scattering data in this material. An additional peak at 58 cm -1, already reported in previous works, shows no detectable Zeeman splitting for magnetic fields up to 6 T along the crystallographic a and c directions, excluding one-magnon scattering as a possible assignment for this peak. The possible nature of this excitation is discussed.

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [1]
  1. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1596726
Report Number(s):
IS-J-10147
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
2017/10581-1; 2018/20142-8; 409504/2018-1; 308607/2018-0; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Rigitano, D., Vaknin, D., Barberis, G. E., and Granado, E. Raman scattering from one and two magnons in magnetoelectric LiNiPO4. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.024417.
Rigitano, D., Vaknin, D., Barberis, G. E., & Granado, E. Raman scattering from one and two magnons in magnetoelectric LiNiPO4. United States. doi:10.1103/PhysRevB.101.024417.
Rigitano, D., Vaknin, D., Barberis, G. E., and Granado, E. Tue . "Raman scattering from one and two magnons in magnetoelectric LiNiPO4". United States. doi:10.1103/PhysRevB.101.024417.
@article{osti_1596726,
title = {Raman scattering from one and two magnons in magnetoelectric LiNiPO4},
author = {Rigitano, D. and Vaknin, D. and Barberis, G. E. and Granado, E.},
abstractNote = {Polarized Raman scattering in magnetoelectric LiNiPO4 shows a sharp resonant peak at 37 cm-1 in the magnetically ordered phase, originating from a one-magnon excitation of Ni2+ S = 1 localized moments at the zone center. Also, a broad component with maximum intensity at ~ 65 cm-1 is observed and successfully modeled in terms of light scattering from two-magnon excitations within the framework of the Fleury-Loudon theory using five relevant exchange parameters, providing an independent experimental confirmation of their values previously obtained with inelastic neutron scattering data in this material. An additional peak at 58 cm-1, already reported in previous works, shows no detectable Zeeman splitting for magnetic fields up to 6 T along the crystallographic a and c directions, excluding one-magnon scattering as a possible assignment for this peak. The possible nature of this excitation is discussed.},
doi = {10.1103/PhysRevB.101.024417},
journal = {Physical Review B},
number = 2,
volume = 101,
place = {United States},
year = {2020},
month = {1}
}

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