Surface electronic phase transition in colossal magnetoresistive manganese perovskites: La{sub 0.65}Sr{sub 0.35}MnO{sub 3}

Journal Article · Mon Jul 24 04:00:00 EDT 2000 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.127047· OSTI ID:20217007

Dulli, Hani ^[1]; Plummer, E W ^[1]; Dowben, P A ^[2]; Choi, Jaewu ^[2]; Liou, S -H ^[2]

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1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)
2. Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska, Lincoln, Nebraska 68588 (United States)

We have observed a distinct surface phase transition for an important class of giant magnetoresistance materials [La{sub 1-x}Sr{sub x}MnO{sub 3}(x=0.35)]. The surface phase transition occurs at 240 K compared to 370 K for the bulk and is fundamentally different. In the bulk, a ferromagnetic metal to paramagnetic bad-metal transition occurs, while the lower-temperature surface transition is from an insulator to a semimetal. The surface of this manganese perovskite is electronically and compositionally quite different from the bulk with important implications for the behavior of artificially grown layered transition-metal oxides and for the use of surface sensitive techniques to probe the bulk. (c) 2000 American Institute of Physics.

• OSTI ID: 20217007
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 77; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXPERIMENTAL DATA
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANESE OXIDES
PEROVSKITES
PHASE TRANSFORMATIONS
STRONTIUM OXIDES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE