Oxygen-deficiency-activated phase transition in a long-aged La[sub 0.8]Ca[sub 0.2]MnO[sub 3] film

Prokhorov, V. G.; Kaminsky, G. G.; Komashko, V. A.; Lee, Y. P.; Park, J. S.; Ri, H. C.
April 2002
Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2707
Academic Journal
The magnetic and transport properties of as-deposited and long-aged La[sub 0.8]Ca[sub 0.2]MnO[sub 3-δ] films have been investigated in a wide temperature range. The x-ray diffraction data have shown separation of the film into two crystalline phases of the cubic and rhombohedral symmetry with different oxygen contents of δ=0.08 and 0.16, respectively, after a half-year aging at room temperature in air. Both phases testify two different electronic (metal–insulator) and magnetic transitions with similar maximum values of magnetoresistance. The possible mechanism for such a type of structural transition in the aged manganite thin films is discussed. © 2002 American Institute of Physics.


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