T
T. C. Koethe
Researcher at University of Cologne
Publications - 9
Citations - 495
T. C. Koethe is an academic researcher from University of Cologne. The author has contributed to research in topics: Electronic structure & Electronic band structure. The author has an hindex of 6, co-authored 6 publications receiving 442 citations.
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Journal ArticleDOI
Transfer of spectral weight and symmetry across the metal-insulator transition in VO2
T. C. Koethe,Zhiwei Hu,Maurits W. Haverkort,Christian Schüßler-Langeheine,F. Venturini,N. B. Brookes,Oscar Tjernberg,W. Reichelt,H. H. Hsieh,Hong-Ji Lin,C. T. Chen,Liu Hao Tjeng +11 more
TL;DR: A giant transfer of spectral weight with distinct features that require an explanation which goes beyond the Peierls transition model as well as the standard single-band Hubbard model is observed.
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Electronic structure of SrPt4Ge12: Combined photoelectron spectroscopy and band structure study
H. Rosner,J. Gegner,D. Regesch,Walter Schnelle,Roman Gumeniuk,Andreas Leithe-Jasper,H. Fujiwara,T. Haupricht,T. C. Koethe,H. H. Hsieh,Hong-Ji Lin,Chien-Te Chen,Alim Ormeci,Yu. Grin,Liu Hao Tjeng +14 more
TL;DR: In this article, a combined study of the electronic structure of the superconducting skutterudite derivative SrPt4Ge12 by means of x-ray photoelectron spectroscopy and full-potential band structure calculations including an analysis of the chemical bonding is presented.
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Spin-state order/disorder and metal–insulator transition in GdBaCo2O5.5: experimental determination of the underlying electronic structure
Zhiwei Hu,Hua Wu,Hua Wu,T. C. Koethe,S. N. Barilo,S. V. Shiryaev,G. L. Bychkov,Christian Schüßler-Langeheine,Thomas Lorenz,Arata Tanaka,H. H. Hsieh,H.J. Lin,C. T. Chen,N. B. Brookes,Stefano Agrestini,Yi Ying Chin,M. Rotter,Liu Hao Tjeng +17 more
TL;DR: In this paper, the electronic structure of GdBaCo2O5.5 was investigated using soft x-ray absorption and photo-electron spectroscopy and it was found 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.
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Electronic structure of RAuMg and RAgMg (R=Eu, Gd, Yb)
J. Gegner,T. C. Koethe,Hua Wu,Zhiwei Hu,H. Hartmann,Thomas Lorenz,Thomas Fickenscher,Rainer Pöttgen,Liu Hao Tjeng +8 more
TL;DR: In this article, the electronic structure of the equiatomic intermetallics using x-ray photoelectron spectroscopy was investigated, and the experimental results were compared with band structure calculations, and they found good agreement provided that the spin-orbit interaction in the Au an $\mathrm{Ag}\phantom{\rule{0.3em}{0ex}}d$ bands is included and correlation effects in an open $4f$ shell are accounted for.
Journal ArticleDOI
Polarization dependent hard X-ray photoemission experiments for solids: Efficiency and limits for unraveling the orbital character of the valence band
J. Weinen,T. C. Koethe,Chun Fu Chang,Stefano Agrestini,Deepa Kasinathan,Y. F. Liao,H. Fujiwara,Christian Schüßler-Langeheine,F. Strigari,T. Haupricht,G. Panaccione,Francesco Offi,Giulio Monaco,Simo Huotari,Ku-Ding Tsuei,Liu Hao Tjeng +15 more
TL;DR: In this article, the authors investigated the efficiency and limits of polarization dependent hard X-ray photoelectron spectroscopy (HAXPES) in order to establish how well this method can be used to unravel quantitatively the contributions of the orbitals forming the valence band of solids.