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  Spin-state order/disorder and metal-insulator transition in GdBaCo2O5.5 : experimental determination of the underlying electronic structure

Hu, Z., Wu, H., Koethe, T. C., Barilo, S. N., Shiryaev, S. V., Bychkov, G. L., et al. (2012). Spin-state order/disorder and metal-insulator transition in GdBaCo2O5.5: experimental determination of the underlying electronic structure. New Journal of Physics, 14(12), 123025-1-123025-12. doi:10.1088/1367-2630/14/12/123025.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1FDD-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1FDE-8
Genre: Journal Article

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Hu, Z.1, Author              
Wu, H., Author
Koethe, T. C., Author
Barilo, S. N., Author
Shiryaev, S. V., Author
Bychkov, G. L., Author
Schüßler-Langeheine, C., Author
Lorenz, T., Author
Tanaka, A., Author
Hsieh, H. H., Author
Lin, H. J., Author
Chen, C. T., Author
Brookes, N. B., Author
Agrestini, S.2, Author              
Chin, Y.-Y.3, Author              
Rotter, M.4, Author              
Tjeng, L. H.5, Author              
Affiliations:
1Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
2Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              
3Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
4Martin Rotter, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863453              
5Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2012-12-12
 Publication Status: Published in print
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Title: New Journal of Physics
Source Genre: Journal
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Pages: - Volume / Issue: 14 (12) Sequence Number: - Start / End Page: 123025-1 - 123025-12 Identifier: ISSN: 1367-2630