Optical spectroscopy of charge transfer transitions in multiferroic manganites, ferrites, and related insulators (Review Article)

• Опубліковано в: : Физика низких температур
• Дата: 2010
• Автори: Moskvin, A.S., Pisarev, R.V.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2010
• Теми: Магнитоэлектрические эффекты в сегнетомагнетиках
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/117048
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Optical spectroscopy of charge transfer transitions in multiferroic manganites, ferrites, and related insulators (Review Article) / A.S. Moskvin, R.V. Pisarev // Физика низких температур. — 2010. — Т. 36, № 6. — С. 613-639. — Бібліогр.: 102 назв. — англ.

We review results of theoretical and experimental studies of charge transfer (CT) transitions in multiferroic manganites, ferrites, and related insulators. Starting with a simple cluster model approach we address both onecenter p–d and two-center d–d CT transitions, their polarization properties, the role played by structural parameters, orbital mixing, and spin degree of freedom. We analyze optical ellipsometry data in the spectral range of 0.6–5.8 eV in perovskite and hexagonal rare-earth manganites RMnO₃ and in orthorhombic manganites RMn₂O₅. We discuss two groups of iron oxides where Fe³⁺ ions occupy either only octahedral positions (BiFeO₃, orhoferrites RFeO₃ et al.) and materials with Fe³⁺ ions both in octahedral and tetrahedral positions (hematite α-Fe₂O₃, garnets RFe₅O₁₂, lithium ferrite LiFe₅O₈, Ca₂Fe₂O₅ et al.).