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A Surface Insulator-to-Conductor Phase Transition in Colossal Magnetoresistive Manganese Perovskites Thin Films

  • C.N. Borca (a1), Bo Xu (a1), Takashi Komesu (a1), Hae-Kyung Jeong (a1), S.-H. Liou (a1) and P.A. Dowben (a1)...

Abstract

We have observed a distinct surface phase transition for an important class of colossal magnetoresistive materials, La0.65D0.35MnO3 (with D = Sr, Pb) occurring in a surface layer compositionally different from the bulk. The surface phase transition occurs around 240 K compared to350 K for the bulk and is fundamentally different. In the bulk, a ferromagnetic metal to paramagnetic ‘bad metal’ occurs, while the lower-temperature surface transition is from an n-type (in case of La0.65D0.35MnO3) or a p-type (in case of La0.65D0.35MnO3) semiconductor to a semimetal with increasing temperature.

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