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.
Журнал: MOLECULES
Выпуск журнала: Vol. 25, Is. 18
Номера страниц: 4316
ISSN журнала: 14203049
Место издания: BASEL
Издатель: MDPI