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Title: Surface inhomogeneities and the electronic phase separated states in thin films of La{sub 0.35}Pr{sub 0.35}Ca{sub 0.3}MnO{sub 3}

We have studied the effects of film thickness and surface inhomogeneities on the fluid and static phase separated states of La{sub 0.35}Pr{sub 0.35}Ca{sub 0.3}MnO{sub 3} films grown on LaAlO{sub 3} and SrTiO{sub 3} substrates which provide compressive and tensile strain, respectively. The shapes and areas of the resistance versus magnetic field hysteresis loops were used to identify the type of phase separated state in the films. Atomic force microscopy revealed an increase of the relative surface roughness of the films with a decreasing thickness. The resultant distribution of the strain produces a dramatic enhancement of the inhomogeneous electronic phase separation as well as large changes in the dependence of the resistivity on magnetic field in the thinnest films deposited on both types of substrates. In contrast to thick films, the static phase separated state in the thinnest films is more inhomogeneous than the fluid phase separated one.
Authors:
; ; ;  [1]
  1. Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1 (Canada)
Publication Date:
OSTI Identifier:
22304015
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; ATOMIC FORCE MICROSCOPY; CALCIUM COMPOUNDS; DISTRIBUTION; HYSTERESIS; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MANGANATES; PRASEODYMIUM COMPOUNDS; ROUGHNESS; STRAINS; STRONTIUM TITANATES; SUBSTRATES; SURFACES; THICKNESS; THIN FILMS