Takegami, D., Nicolai, L., Koethe, T. C., Kasinathan, D., Kuo, C. Y., Liao, Y. F., Tsuei, K. D., Panaccione, G., Offi, F., Monaco, G., Brookes, N. B., Minar, J. and Tjeng, L. H. (2019). Valence band hard x-ray photoelectron spectroscopy on 3d transition-metal oxides containing rare-earth elements. Phys. Rev. B, 99 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Here we report on our study to quantitatively describe the intensities of the valence band hard x-ray photoemission spectra (HAXPES) of a rare earth element containing 3d transition metal oxides. Using LaCoO3 as a representative model compound, we compared the experimental data to the results of ab initio one-step photoemission band structure calculations as well as to the sum of the partial density of states of the atomic constituents weighted by their tabulated photoionization cross sections. We discovered that the semicore La 5p density of states surprisingly contributes in a significant manner to the valence band spectrum: Although the La 5p partial density of states in the valence band region is negligible compared to that of the O 2p or the Co 3d, the La 5p cross section in the hard x-ray range is found to be orders of magnitude larger than that of the other subshells. This explains the long-standing issue of why the hard x-ray valence band spectra of a rare-earth element containing materials have line shapes that are very different from those taken at lower photon energies and why they cannot be described in terms of partial density of states of the subshells usually considered for the lower photon energy spectra. We infer that the contribution of the rare-earth 5p must be taken into account and cannot be ignored.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Takegami, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nicolai, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koethe, T. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kasinathan, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuo, C. Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Liao, Y. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tsuei, K. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Panaccione, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Offi, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Monaco, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brookes, N. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Minar, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tjeng, L. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-151153
DOI: 10.1103/PhysRevB.99.165101
Journal or Publication Title: Phys. Rev. B
Volume: 99
Number: 16
Date: 2019
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ANGULAR-DISTRIBUTION PARAMETERS; HIGH-ENERGY PHOTOEMISSION; ELECTRONIC-STRUCTUREMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15115

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