skip to main content

Title: 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)

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}.
Authors:
;  [1]
  1. Department of Physics, University of Illinois at Chicago, Chicago 60607 (United States)
Publication Date:
OSTI Identifier:
22402807
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COBALT IONS; CRYSTAL STRUCTURE; DOPED MATERIALS; ENERGY-LOSS SPECTROSCOPY; FINE STRUCTURE; MAGNETIZATION; MONOCRYSTALS; PHASE DIAGRAMS; SPIN