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  Ab initio cluster calculations of Co3+ spin states in RBaCo2O5.5 (R = Ho, Gd)

Siurakshina, L., Paulus, B., & Yushankhai, V. (2008). Ab initio cluster calculations of Co3+ spin states in RBaCo2O5.5 (R = Ho, Gd). The European Physical Journal B, 63, 445-450. doi:10.1140/epjb/e2008-00263-1.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-2782-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-F3EA-3
Genre: Journal Article

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 Creators:
Siurakshina, L., Author
Paulus, B., Author
Yushankhai, V.1, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              

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 Abstract: Two types of oxygen-deficient perovskites RBaCo2O5.5(R=Ho, Gd) related to the "122" type structure (a(p) X 2a(p) X 2a(p)) have been studied on the basis of ab initio cluster calculations. We consider the peculiar behavior of the trivalent ions Co3+(3d(6)) in either octahedral or pyramidal oxygen coordinations, which is related to a structural first-order phase transition in both compounds. Relative energy positions of low spin (LS, S = 0), intermediate spin (IS, S = 1) and high spin (HS, S = 2) electron configurations are calculated for the low- and high-temperature lattice structures of RBaCo2O5.5. A combined analysis of the calculated results and experimental structural data leads to a simple model that captures the most prominent features of the phase transition common to both compounds.

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Language(s): eng - English
 Dates: 2008-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 378242
ISI: 000258537600005
DOI: 10.1140/epjb/e2008-00263-1
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Title: The European Physical Journal B
Source Genre: Journal
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Pages: - Volume / Issue: 63 Sequence Number: - Start / End Page: 445 - 450 Identifier: ISSN: 1434-6028