Magnetic and electronic phase separation driven by structural clustering in La₀.₇ (Ca₁₋ySry)₀.₃ MnO₃ thin films

Magnetic and electronic phase separation driven by structural clustering in La₀.₇ (Ca₁₋ySry)₀.₃ MnO₃ thin films

Prokhorov, V.G. ; Komashko, V.A. ; Kaminsky, G.G. ; Lee, Y.P. ; Hyun, Y.H. ; Yu, K.K. ; Park, J.S. ; Svetchnikov, V.L.

Тема: Низкотемпеpатуpный магнетизм

Інший ID: PACS: 75.70.–i, 75.47.–m, 71.30.+h

URI: http://dspace.nbuv.gov.ua/handle/123456789/120220

Посилання: Magnetic and electronic phase separation driven by structural clustering in La₀.₇ (Ca₁₋ySry)₀.₃ MnO₃ thin films / V.G. Prokhorov, V.A. Komashko, G.G. Kaminsky, Y.P. Lee, Y.H. Hyun, K.K. Yu, J.S. Park, V.L. Svetchnikov // Физика низких температур. — 2006. — Т. 32, № 7. — С. 853–860. — Бібліогр.: 34 назв. — англ.

Підтримка: This work was supported by the KOSEF through the Quantum Photonic Science Research Center.

Дата: 2006

Завантажень: 565

Magnetic and electronic phase separation driven by structural clustering in La₀.₇ (Ca₁₋ySry)₀.₃ MnO₃ thin films

Анотація:

The structural, magnetic and transport properties of La₀.₇ (Ca₁₋ySry)₀.₃ MnO₃ 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 (R c3 ) 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₋ySry)₀.₃ MnO₃ thin-film system is presented.

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