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  • IR reflectivity spectra of SrMnO3 ceramics reveal 18% stiffening of the lowest-frequency phonon below the antiferromagnetic phase transition occuring at T_N = 233 K. Such a large temperature change of the polar phonon frequency is extraordinary and we attribute it to an exceptionally strong spin-phonon coupling in this material. This is consistent with our prediction from first-principles calculations. Moreover, polar phonons become Raman active below T_N, although their activition is forbidden by symmetry in the Pm3m space group.
  • IR reflectivity spectra of SrMnO3 ceramics reveal 18% stiffening of the lowest-frequency phonon below the antiferromagnetic phase transition occuring at T_N = 233 K. Such a large temperature change of the polar phonon frequency is extraordinary and we attribute it to an exceptionally strong spin-phonon coupling in this material. This is consistent with our prediction from first-principles calculations. Moreover, polar phonons become Raman active below T_N, although their activition is forbidden by symmetry in the Pm3m space group. (en)
Title
  • Strong spin-phonon coupling in infrared and Raman spectra of SrMnO3.
  • Strong spin-phonon coupling in infrared and Raman spectra of SrMnO3. (en)
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  • Strong spin-phonon coupling in infrared and Raman spectra of SrMnO3.
  • Strong spin-phonon coupling in infrared and Raman spectra of SrMnO3. (en)
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  • RIV/68378271:_____/14:00431294!RIV15-GA0-68378271
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  • I, P(GAP204/12/1163), P(GP14-14122P), P(LD12026), P(LH13048)
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  • RIV/68378271:_____/14:00431294
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  • multiferroics; spin-phonon coupling; infrared and Raman spectra (en)
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  • Physical Review. B
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  • 89
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  • Bovtun, Viktor
  • Kamba, Stanislav
  • Kempa, Martin
  • Lee, J. H.
  • Borodavka, Fedir
  • Goian, Veronica
  • Pacherová, Oliva
  • Vaněk, Přemysl
  • Hejtmánek, Jiří
  • Skoromets, Volodymyr
  • Belik, A. A.
  • Rabe, K. M.
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  • 000332409900002
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  • 1098-0121
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  • 10.1103/PhysRevB.89.064308
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