Universität zu Köln

Hu, Z., Wu, Hua ORCID: 0000-0003-1280-202X, Koethe, T. C., Barilo, S. N., Shiryaev, S. V., Bychkov, G. L., Schuessler-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. and Tjeng, L. H. (2012). Spin-state order/disorder and metal-insulator transition in GdBaCo2O5.5: experimental determination of the underlying electronic structure. New J. Phys., 14. BRISTOL: IOP PUBLISHING LTD. ISSN 1367-2630

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Abstract

We have investigated the electronic structure of GdBaCo2O5.5 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 Co3+ ions at the octahedral sites are in the low spin (LS) and the other half in the high spin (HS) state, while the Co3+ ions at the pyramidal sites are in the HS configuration. Upon increasing the temperature across the MIT, part of the LS octahedral Co3+ 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hu, Z. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Hua UNSPECIFIED orcid.org/0000-0003-1280-202X UNSPECIFIED Koethe, T. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barilo, S. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shiryaev, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bychkov, G. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schuessler-Langeheine, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanaka, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hsieh, H. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lin, H-J UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, C. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brookes, N. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Agrestini, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chin, Y-Y UNSPECIFIED UNSPECIFIED UNSPECIFIED Rotter, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tjeng, L. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-476693
DOI:	10.1088/1367-2630/14/12/123025
Journal or Publication Title:	New J. Phys.
Volume:	14
Date:	2012
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1367-2630
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXYGEN; 3D Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47669