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Title: Thickness-dependent magnetic and electrical transport properties of epitaxial La 0.7Sr 0.3CoO 3 films

The thickness-dependent magnetic and electrical transport properties of nearly strain-free La 0.7Sr 0.3CoO 3 (LSCO) films grown on (001)-oriented (LaAlO 3 ) 0.3 (Sr 2AlTaO 6) 0.7 substrates were systematically studied. A crossover from ferromagnetic/metallic to non-magnetic/insulating behavior occurs at a critical thickness (~8 nm) that is significantly smaller than LSCO films under larger strains in reported literature. X-ray absorption measurements revealed that the difference of functional properties at reduced film thicknesses was accompanied by changes in the valence state of Co ions at the film/substrate interface.
Authors:
 [1] ; ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [1]
  1. Univ. of California, Davis, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1361811
Alternate Identifier(s):
OSTI ID: 1379789; OSTI ID: 1421016