Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
권호 표지

Structural Clustering and Magnetic Phase Separation in La0.7(Ca1-ySry)0.3MnO3 Thin Films

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

  • Published : 20060000
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Abstract

The structural, magnetic, and transport properties of the La0.7(Ca1.ySry)0.3MnO3 films prepared by rf-magnetron sputtering have been investigated. At 0.3 y 0.5, both the rhombohedral (R3c) and orthorhombic (Pnma) crystal phases in the form of nanoscale clusters were found to co-exist at room temperature. The observed structural clustering is accompanied by two-stage magnetic and electronic transition, has a metallurgical origin, and is governed by the nonuniform distribution of the lattice strain through the film. The magnetotransport properties of the films can be explained within the framework of a field-dependent activation energy model, considering the spin-dependent trapping of charges and the Weiss-magnetization contribution.

Keywords

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