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Competition between ferromagnetic metallic and paramagnetic insulating phases in manganites
Physics Faculty Research
  • G. Li
  • H. D. Zhou
  • S. J. Feng
  • Xiaojuan Fan, Marshall University
  • X. G. Li
  • Z. D. Wang
Document Type
Article
Publication Date
8-1-2002
Abstract
La0.67Ca0.33Mn1−xCuxO3(x=0 and 0.15) epitaxial thin films were grown on the (100) LaAlO3 substrates, and the temperature dependence of their resistivity was measured in magnetic fields up to 12 T by a four-probe technique. We found that the competition between the ferromagnetic metallic (FM) and paramagnetic insulating (PI) phases plays an important role in the observed colossal magnetoresistance(CMR) effect. Based on a scenario that the doped manganites approximately consist of phase-separated FM and PI regions, a simple phenomenological model was proposed to describe the CMR effect. Using this model, we calculated the resistivity as functions of temperature and magnetic field. The model not only qualitatively accounts for some main features related to the CMR effect, but also quantitatively agrees with the experimental observations.
Comments

Copyright 2002 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in G. Li, H.-D. Zhou, S. J. Feng, X.-J. Fan, X.-G. Li, and Z. D. Wang, J. Appl. Phys. 92, 1406 (2002), and may be found at http://scitation.aip.org/content/aip/journal/jap/92/3/10.1063/1.1490153. Printed with permission.

Citation Information
Li, G., Zhou, H. D., Feng, S. J., Fan, X. J., Li, X. G., & Wang, Z. D. (2002). Competition between ferromagnetic metallic and paramagnetic insulating phases in manganites. Journal of Applied Physics, 92(3), 1406-1410.