RT Journal Article
T1 Long-range ferromagnetic order in LaCoO3-delta epitaxial films due to the interplay of epitaxial strain and oxygen vacancy ordering
A1 Mehta, V. V.
A1 Biskup Zaja, Nevenko
A1 Jenkins, C.
A1 Arenholz, E.
A1 Varela del Arco, María
A1 Suzuki, Y.
AB We demonstrate that a combination of electronic structure modification and oxygen vacancy ordering can stabilize a long-range ferromagnetic ground state in epitaxial LaCoO_(3) thin films. Highest saturation magnetization values are found in the thin films in tension on SrTiO_(3) and (La,Sr)(Al,Ta)O_(3) substrates and the lowest values are found in thin films in compression on LaAlO_(3). Electron microscopy reveals oxygen vacancy ordering to varying degrees in all samples, although samples with the highest magnetization are the most defective. Element-specific x-ray absorption techniques reveal the presence of high spin Co^(2+) and Co^(3+) as well as low spin Co^(3+) in different proportions depending on the strain state. The interactions among the high spin Co ions and the oxygen vacancy superstructure are correlated with the stabilization of the long-range ferromagnetic order.
PB American Physical Society
SN 1098-0121
YR 2015
FD 2015-04-23
LK https://hdl.handle.net/20.500.14352/24036
UL https://hdl.handle.net/20.500.14352/24036
LA eng
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NO © 2015 American Physical Society. We thank Kin Man Yu for help with RBS as well as Juan Salafranca, Marco Liberati, Rajesh Chopdekar, Joanna Bettinger, Franklin Wong, Jodi Iwata-Harms, and Chunyong He. Research at UC Berkeley/LBNL and Stanford was supported by the U.S. Department of Energy, Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contracts No. DE-AC02-05CH11231 (Berkeley and LBNL) and No. DESC0008505 (Stanford). STEM/EELS research at ORNL (M.V.) was supported by the U.S. Department of Energy, Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering and through a user project supported by ORNL’s Center for Nanophase Materials Sciences (CNMS), which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. STEM/EELS research at UCM (N.B.) was supported by the ERC starting Investigator Award, Grant No. 239739 STEMOX and Fundación Caja de Madrid.
NO U.S. Department of Energy, Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
NO ORNL’s Center for Nanophase Materials Sciences (CNMS)
NO Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
NO ERC starting Investigator Award
NO Fundación Caja de Madrid
DS Docta Complutense
RD 30 abr 2024