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Open Access item Role of A-site cations in the metal-insulator transition in Pr0.5Ca0.5CoO3−γ (γ≈0)

Authors:Barón-González, A. J.
Frontera Beccaria, Carlos
García-Muñoz, J. L.
Blasco, Javier
Ritter, C.
Issue Date:Feb-2010
Publisher:American Physical Society
Citation:Physical Review B 81(5): 054427 (2010)
Abstract:Remarkable structural changes take place during the metal to insulator first-order transition in Pr0.50Ca0.50CoO3: a contraction of the unit-cell volume, the bending of the Co-O-Co bond angle, and a decrease in (Pr,Ca)-O bond distance. However, the Co-O bond length and the volume of the CoO6 octahedra remain almost unaltered during the transition. In view of these data and the absence of transition in (Nd2/3La1/3)0.5Ca0.5CoO3, we review the current spin-state transition picture, emphasizing that an active role is played by the A-site Pr cations that could be related with the effect of Pr in 123 superconducting cuprates.
Description:6 páginas, 4 figuras, 1 tabla.-- PACS number(s): 71.30.+h, 61.05.fm, 75.30.Kz, 75.47.De
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevB.81.054427
URI:http://hdl.handle.net/10261/47654
ISSN:1098-0121
E-ISSNmetadata.dc.identifier.doi = DOI:1550-235X
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