Magnetic phase diagram and structural separation of La0.7(Ca1−ySry)0.3MnO3 thin films | Zendy

Y. P. Lee | Zendy; S. Y. Park | Zendy; Jin-Seok Park | Zendy; V. G. Prokhorov | Zendy; V. A. Komashko | Zendy; V. L. Svetchnikov | Zendy; J.-H. Kang | Zendy

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Magnetic phase diagram and structural separation of La0.7(Ca1−ySry)0.3MnO3 thin films

Author(s) -

Y. P. Lee,

S. Y. Park,

Jin-Seok Park,

V. G. Prokhorov,

V. A. Komashko,

V. L. Svetchnikov,

J.-H. Kang

Publication year - 2007

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.2435991

Subject(s) - materials science , orthorhombic crystal system , condensed matter physics , phase diagram , thin film , sputter deposition , magnetoresistance , magnetization , crystal structure , sputtering , phase (matter) , magnetic field , crystallography , nanotechnology , chemistry , physics , organic chemistry , quantum mechanics

The structural, magnetic, and transport properties of La0.7(Ca1?ySry)0.3MnO3 films, deposited on a LaAlO3?(001) single crystalline substrate by rf-magnetron sputtering using “soft” (or powder) targets, have been investigated. It was found that at 0.3 ? y ? 0.5 both the rhombohedral (R3c) and the orthorhombic (Pnma) crystal phases in the form of nanoscale clusters are coexistent at room temperature. The observed structural clustering is accompanied by two-stage magnetic and electronic transitions, and governed by a nonuniform distribution of the lattice strain through the film. It was shown that for the films with 0 ? y ? 0.5 the nonlinear (almost parabolic) MR(H) dependence is typical while, for 0.65 ? y ? 1.0, the linear MR(H) behavior is observed at room temperature. The magnetotransport properties of films are explained within the framework of field-dependent activation-energy model. The magnetic phase diagram for La0.7(Ca1?ySry)0.3MnO3 thin-film system is also presented

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