arXiv Analytics

Sign in

arXiv:cond-mat/9906209AbstractReferencesReviewsResources

Electronic Structure of Cu_(1-x)Ni_xRh_2S_4 and CuRh_2Se_4: Band Structure Calculations, X-ray Photoemission and Fluorescence Measurements

G. L. W. Hart, W. E. Pickett, E. Z. Kurmaev, D. Hartmann, A. Moewes, M. Neumann, D. L. Ederer, R. Endoh, K. Taniguchi, S. Nagata

Published 1999-06-15Version 1

The electronic structure of spinel-type Cu_(1-x)Ni_xRh_2S_4 (x = 0.0, 0.1, 0.3, 0.5, 1.0) and CuRh_2Se_4 compounds has been studied by means of X-ray photoelectron and fluorescent spectroscopy. Cu L_3, Ni L_3, S L_(2,3) and Se M_(2,3) X-ray emission spectra (XES) were measured near thresholds at Beamline 8.0 of the Lawrence Berkeley Laboratory's Advanced Light Source. XES measurements of the constituent atoms of these compounds, reduced to the same binding energy scale, are found to be in excellent agreement with XPS valence bands. The calculated XES spectra which include dipole matrix elements show that the partial density of states reproduce experimental spectra quite well. States near the Fermi level (E_F) have strong Rh d and S(Se) p character in all compounds. In NiRh_2S_4 the Ni 3d states contribute strongly at E_F, whereas in both Cu compounds the Cu 3d bands are only ~1 eV wide and centered ~2.5 eV below E_F, leaving very little 3d character at E_F. The density of states at the Fermi level is less in NiRh_2S_4 than in CuRh_2S_4. This difference may contribute to the observed decrease, as a function of Ni concentration, in the superconducting transition temperature in Cu_(1-x)Ni_xRh_2S_4. The density of states of the ordered alloy Cu_(1/2)Ni_(1/2)Rh_2S_4 shows behavior that is more ``split-band''-like than ``rigid band''-like.

Comments: 7 pages of text, 11 trailing figures, updated to fix faulty postscript in Fig. 3
Journal: Physical Review B (Condensed Matter); 1 Feb. 2000; vol.61, no.6, p.4230-7
Categories: cond-mat.mtrl-sci
Related articles: Most relevant | Search more
arXiv:0710.4841 [cond-mat.mtrl-sci] (Published 2007-10-25)
Electronic structure of the c(4 x 2) reconstructed Ge(001) surface
arXiv:cond-mat/0409558 (Published 2004-09-21)
Electronic structure of nanocones of boron nitrite
arXiv:0804.2171 [cond-mat.mtrl-sci] (Published 2008-04-14)
Electronic structures of defective BN nanotubes under transverse electric fields