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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2012     Display Documents



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ID: 628943.0, MPI für Chemische Physik fester Stoffe / publications 2012
Spin-state order/disorder and metal-insulator transition in GdBaCo2O5.5 : experimental determination of the underlying electronic structure
Authors:Hu, Z.; Wu, H.; Koethe, T. C.; Barilo, S. N.; Shiryaev, S. V.; Bychkov, G. L.; Schüßler-Langeheine, C.; Lorenz, T.; Tanaka, A.; Hsieh, H. H.; Lin, H. J.; Chen, C. T.; Brookes, N. B.; Agrestini, S.; Chin, Y.-Y.; Rotter, M.; Tjeng, L. H.
Language:English
Date of Publication (YYYY-MM-DD):2012-12-12
Title of Journal:New Journal of Physics
Volume:14
Issue / Number:12
Start Page:123025-1
End Page:123025-12
Review Status:not specified
Audience:Not Specified
Abstract / Description:We have investigated the electronic structure of GdBaCo 2 O 5.5 across the metal–insulator transition (MIT) using soft x-ray absorption and photoelectron spectroscopy. For the low-temperature insulating phase, we find that half of the Co 3+ ions at the octahedral sites are in the low spin (LS) and the other half in the high spin (HS) state, while the Co 3+ ions at the pyramidal sites are in the HS configuration. Upon increasing the temperature across the MIT, part of the LS octahedral Co 3+ undergoes a spin-state transition into the HS configuration. We infer that this destroys the spin-state ordering and thus explains the decrease in resistivity. We observed that the band gap is reduced but not closed in the high-temperature phase.
External Publication Status:published
Document Type:Article
Communicated by:Ina Werner
Affiliations:MPI für chemische Physik fester Stoffe
Identifiers:ISSN:1367-2630 [ID No:1]
URL:http://stacks.iop.org/1367-2630/14/i=12/a=123025 [ID No:2]
DOI:10.1088/1367-2630/14/12/123025
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