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Title: Nanodomain induced anomalous magnetic and electronic transport properties of LaBaCo{sub 2}O{sub 5.5+δ} highly epitaxial thin films

A giant magnetoresistance effect (∼46% at 20 K under 7 T) and anomalous magnetic properties were found in a highly epitaxial double perovskite LaBaCo{sub 2}O{sub 5.5+δ} (LBCO) thin film on (001) MgO. Aberration-corrected Electron Microscopy and related analytical techniques were employed to understand the nature of these unusual physical properties. The as-grown film is epitaxial with the c-axis of the LBCO structure lying in the film plane and with an interface relationship given by (100){sub LBCO} || (001){sub MgO} and [001]{sub LBCO} || [100]{sub MgO} or [010]{sub MgO}. Orderly oxygen vacancies were observed by line profile electron energy loss spectroscopy and by atomic resolution imaging. Especially, oxygen vacancy and nanodomain structures were found to have a crucial effect on the electronic transport and magnetic properties.
Authors:
; ; ; ; ; ; ;  [1] ;  [1] ;  [2] ; ; ;  [3]
  1. Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas 78249 (United States)
  2. (United States)
  3. The Texas Center for Superconductivity, University of Houston, Houston, Texas 77204 (United States)
Publication Date:
OSTI Identifier:
22271268
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 2; 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; BARIUM COMPOUNDS; COBALT OXIDES; CUBIC LATTICES; ELECTRON MICROSCOPY; ELECTRONS; ENERGY-LOSS SPECTROSCOPY; EPITAXY; INTERFACES; LANTHANUM COMPOUNDS; MAGNESIUM OXIDES; MAGNETIC PROPERTIES; MAGNETORESISTANCE; OXYGEN; TEMPERATURE DEPENDENCE; THIN FILMS; VACANCIES