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

Автор(и)

  • V.G. Prokhorov Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
  • V.A. Komashko Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
  • G.G. Kaminsky Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
  • Y.P. Lee q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • Y.H. Hyun q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • K.K. Yu q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • J.S. Park q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • V.L. Svetchnikov National Center for HREM, TU Delft 2628AL, The Netherlands

DOI:

https://doi.org/10.1063/1.2216217

Ключові 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.

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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

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