The manifestation of spin-phonon coupling in CaMnO{sub 3}
- Institute of Physics, The Czech Academy of Sciences, Na Slovance 2, 182 21 Prague (Czech Republic)
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
Recently predicted presence of spin-phonon coupling in the CaMnO{sub 3} is experimentally confirmed in infrared (IR), Raman and time-domain THz spectra. Most of phonon frequencies seen below 350 cm{sup −1} exhibit significant shifts on cooling below antiferromagnetic phase transition at T{sub N} ≅ 120 K. Moreover, several new modes activate in the IR and Raman spectra on cooling below T{sub N}. Sum of phonon contributions to static permittivity exhibits small but reliable anomaly at T{sub N}. On the other hand, the spin-phonon coupling is not manifested in temperature dependence of radio-frequency permittivity, because intrinsic permittivity is screened by extrinsic contribution from conductivity, which enhances the permittivity to giant values.
- OSTI ID:
- 22402926
- Journal Information:
- Journal of Applied Physics, Vol. 117, Issue 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spin-phonon coupling and high-pressure phase transitions of RMnO3 (R=Ca and Pr): An inelastic neutron scattering and first-principles study
Magnetic and low temperature phonon studies of CoCr{sub 2}O{sub 4} powders doped with Fe(III) and Ni(II) ions