A surface insulator-to-conductor phase transition in colossal magnetoresistive manganese perovskites thin films

C. N. Borca, Bo Xu, Takashi Komesu, Hae Kyung Jeong, S. H. Liou, P. A. Dowben

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have observed a distinct surface phase transition for an important class of colossal magnetoresistive materials, La 0.65D 0.35MnO 3 (with D = Sr, Pb) occurring in a surface layer compositionally different from the bulk. The surface phase transition occurs around 240 K compared to 350 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 La 0.65Sr 0.35MnO 3) or a p-type (in case of La 0.65Pb 0.35MnO 3) semiconductor to a semimetal with increasing temperature.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsJ Amar, G Gilmer, M V Ramana Murty, J Sanchez JR
Volume672
StatePublished - 2001
EventMechanisms of Surface and Microstructure Evolution in Deposited Films and Structures - San Francisco, CA, United States
Duration: Apr 17 2001Apr 20 2001

Other

OtherMechanisms of Surface and Microstructure Evolution in Deposited Films and Structures
CountryUnited States
CitySan Francisco, CA
Period4/17/014/20/01

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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    Borca, C. N., Xu, B., Komesu, T., Jeong, H. K., Liou, S. H., & Dowben, P. A. (2001). A surface insulator-to-conductor phase transition in colossal magnetoresistive manganese perovskites thin films. In J. Amar, G. Gilmer, M. V. Ramana Murty, & J. Sanchez JR (Eds.), Materials Research Society Symposium - Proceedings (Vol. 672)