Contribution of the Multiplicity Fluctuation in the Temperature Dependence of Phonon Spectra of Rare-Earth Cobaltites : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.3390/molecules25184316

Ключевые слова: rare-earth cobalt oxides, multiplicity fluctuations, phonon spectra

Аннотация: We have studied, both experimentally and theoretically, the unusual temperature dependence of the phonon spectra in NdCoO3, SmCoO(3)and GdCoO3, where the Co(3+)ion is in the low-spin (LS) ground state, and at the finite temperature, the high-spin (HS) term has a nonzero concentrationnHSdue to multiplicity fluctuations. We measured Показать полностьюthe absorption spectra in polycrystalline and nanostructured samples in the temperature range 3-550 K and found a quite strong breathing mode softening that cannot be explained by standard lattice anharmonicity. We showed that the anharmonicity in the electron-phonon interaction is responsible for this red shift proportional to thenHSconcentration.

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Издание

Журнал: MOLECULES

Выпуск журнала: Vol. 25, Is. 18

Номера страниц: 4316

ISSN журнала: 14203049

Место издания: BASEL

Издатель: MDPI

Персоны

  • Orlov Yuri S. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Sokolov Alexey E. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Dudnikov Vyacheslav A. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia)
  • Shulga Karina V. (Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Volochaev Mikhail N. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia)
  • Zharkov Sergey M. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
  • Shestakov Nikolay P. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia)
  • Vysotin Maxim A. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia)
  • Ovchinnikov Sergei G. (RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)