High pressure induced spin state crossover in Sr2CaYCo4O10.5

The layered cobaltite Sr2CaYCo4O10.5 with formal average cobalt oxidation state close to 3+ has been studied as functions of both temperature and pressure up to 4GPa by neutron powder diffraction (NPD). The crystal structure is shown to have tetragonal symmetry (space group I4/mmm; 2a(p) x 2a(p) x 4a(p) superstructure), and the magnetic structure at ambient pressure is found to be G-type antiferromagnetic with T-N close to 310 K. The magnetic moments within the CoO6 octahedral layers and anion-deficient CoO4.5 layers are 1.2 mu(B) and 2.8 mu(B), respectively. At 25K, and applied pressure of 3.5 GPa is sufficient to completely suppress a long-range magnetic order. This result is interpreted in terms of a pressure-induced high-to-low spin state crossover of the Co3+ ions.


Published in:
Journal Of Physics-Condensed Matter, 27, 4
Year:
2015
Publisher:
Bristol, Institute of Physics
ISSN:
0953-8984
Keywords:
Laboratories:




 Record created 2015-05-29, last modified 2018-03-17


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