Magnetic and electronic phase separation driven by structural clustering in La0.7 (Ca1-y Sry)0.3MnO3 thin films
DOI:
https://doi.org/10.1063/1.2216217Ключові слова:
structural, magnetic and transport properties; magnetic phase diagram; crystal phases.Анотація
The structural, magnetic and transport properties of La0.7 (Ca1-y Sry)0.3MnO3 films deposited on LaAlO3 (001) single-crystalline substrate by rf-magnetron sputtering using «soft» (or powder) targets are investigated. It was found that at 0.3 ≤ y ≤ 0.5 both rhombohedral (R̅3c) and orthorhombic (Pnma) crystal phases are coexistent at room temperature, forming a nanoclustered microstructure. The clustered films manifest the two-stage magnetic and electronic transition, which are typical for the phase-separated systems. It was shown that for 0.5≥ y ≥0 the nonlinear (almost parabolic) field-dependent magnetoresistance is typical at room temperature while for 0.65≤ y ≤1.0 its transform to the linear behavior. The magnetotransport properties of the films are explained within the framework of a field-dependent activation energy model. The magnetic phase diagram for the La0.7 (Ca1-y Sry)0.3MnO3 thin-film system is presented.Завантаження
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Опубліковано
2006-05-17
Як цитувати
(1)
Prokhorov, V.; Komashko, V.; Kaminsky, G.; Lee, Y.; Hyun, Y.; Yu, K.; Park, J.; Svetchnikov, V. Magnetic and Electronic Phase Separation Driven by Structural Clustering in La0.7 (Ca1-y Sry)0.3MnO3 Thin Films. Fiz. Nizk. Temp. 2006, 32, 853-860.
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Низькотемпературний магнетизм