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

MPS-Authors
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Hu,  Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Agrestini,  S.
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Chin,  Y.-Y.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rotter,  M.
Martin Rotter, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-1FDD-A
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.