Direct measurement of the low temperature spin state transitions in La{sub 1−x}Sr{sub x}CoO{sub 3} (0.05 < x < 0.3)
- Department of Physics, University of Illinois at Chicago, Chicago 60607 (United States)
Sr-doped LaCoO{sub 3} has a complex magnetic phase diagram, which is believed to be directly correlated to changes in the crystal structure and ordering of the Co{sup 3+} spin states. In this work, we study the low temperature Co{sup 3+}-ion spin state transitions in Sr-doped LaCoO{sub 3} around the critical doping concentration where a metal to insulator transition has been observed using electron energy-loss spectroscopy of the O K-edge combined with the Co L-edge fine structure. We measure the local spin state of the Co{sup 3+}-ions and we demonstrate that the Co{sup 3+} spin-state transition only occurs in La{sub 0.95}Sr{sub 0.05}CoO{sub 3} single-crystal materials in the temperature range accessible by LN{sub 2} in-situ cooling, while no structural symmetry change is observed. The presence of this low-temperature spin-state transition in La{sub 1−x}Sr{sub x}CoO{sub 3} (x < 0.17) has been proposed as the origin of the percolative magnetic ordering in doped LaCoO{sub 3}.
- OSTI ID:
- 22402807
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 23 Vol. 116; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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