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Metal-Insulator transition induced by oxygen isotop exchange in the magnetoresistive perovskite manganitesстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Babushkina N.A., Belova L.M., Gorbenko O.Yu, Kaul A.R., Bosak A.a., Kugel K.I., Ozhogin V.L.
- Журнал: Nature
- Том: 391
- Год издания: 1998
- Издательство: Nature Publishing Group
- Местоположение издательства: United Kingdom
- Первая страница: 159
- Последняя страница: 161
- DOI: 10.1038/34380
- Аннотация: Perovskite manganites derived from LaMnO3 have recently become the subject of intensive study following the discovery of ‘colossal’ magnetoresistance (a magnetically induced change in electrical resistance of up to several orders of magnitude) in several members of this family of compounds1. The manganites exhibit a broad range of electronic and magnetic phases, ranging from low-resistance ferromagnetic metals to high-resistance insulators, which are extremely sensitive to variation of composition2, temperature and pressure3. A recent study showed that such sensitivity also extends to oxygen isotope exchange4: replacing 16O with 18O in La0.8Ca0.2MnO3 produces an unusually large change in the magnetic properties (a 21-kelvin decrease in the Curie temperature). The magnitude of this isotope shift is evidence for the essential role played by electron–phonon coupling5 in determining the transport properties of these materials. Here we show that this sensitivity to oxygen isotope exchange can be even more extreme. In its normal state, the compound La0.175Pr0.525Ca0.3MnO3 undergoes an insulator-to-metal transition as it is cooled below ∼95 K. But we find that, after substituting 18O for 16O, the compound remains an insulator down to 4.2 K, so providing a vivid demonstration of the importance of lattice vibrations in these materials.
- Добавил в систему: Кауль Андрей Рафаилович