Metal-insulator transition in colossal magnetoresistance materials

Journal Article · Tue Aug 01 00:00:00 EDT 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.62.3010· OSTI ID:20217221

Smolyaninova, V N ^[1]; Xie, X C ^[1]; Zhang, F C ^[1]; Rajeswari, M ^[1]; Greene, R L ^[1]; Das Sarma, S ^[1]

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1. Department of Physics and Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States)

We report on resistivity measurements in La{sub 0.67}Ca{sub 0.33}MnO{sub 3} and Nd{sub 0.7}Sr{sub 0.3}MnO{sub 3} thin films in order to elucidate the underlying mechanism for the colossal magnetoresistance behavior. The experimental results are analyzed in terms of quantum phase-transition ideas to study the nature of the metal-insulator transition in manganese oxides. Resistivity curves as functions of magnetization for various temperatures show the absence of scaling behavior expected in a continuous quantum phase transition, which leads us to conclude that the observed metal-insulator transition is most likely a finite temperature crossover phenomenon. (c) 2000 The American Physical Society.

• OSTI ID: 20217221
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 62, Issue 5; Other Information: PBD: 1 Aug 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNETORESISTANCE
LANTHANUM OXIDES
CALCIUM OXIDES
MANGANESE OXIDES
STRONTIUM OXIDES
NEODYMIUM OXIDES
PEROVSKITES
MAGNETIZATION
PHASE TRANSFORMATIONS
SCALING LAWS
TEMPERATURE DEPENDENCE
THIN FILMS
FERROMAGNETIC MATERIALS
EXPERIMENTAL DATA
THEORETICAL DATA