Journal
PHYSICAL REVIEW B
Volume 85, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.020403
Keywords
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Funding
- US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- US DOE [DE-AC02-06CH11357]
- DMEA/CNN [H94003-10-2-1004.3]
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We have examined the atomic and electronic structures of perovskite lanthanum cobaltite (LaCoO3) thin films using Co K-edge x-ray absorption fine structure (XAFS) spectroscopy. Extended XAFS (EXAFS) demonstrates that a large difference between in-plane and out-of-plane Co-O bond lengths results from tetragonal distortion in highly strained films. The structural distortions are strongly coupled to the hybridization between atomic orbitals of the Co and O atoms, as shown by x-ray absorption near edge spectroscopy (XANES). Our results indicate that increased hybridization is not the cause of ferromagnetism in strained LaCoO3 films. Instead, we suggest that the strain-induced distortions of the oxygen octahedra increase the population of e(g) electrons and concurrently depopulate t(2g) electrons beyond a stabilization threshold for ferromagnetic order.
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