X-ray fluorescence measurements of organic superconductors {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br and {kappa}-(ET){sub 2}Cu(NCS){sub 2}
- Institute of Metal Physics, Russian Academy of Sciences--Ural Division, 620219 Yekaterinburg GSP-170 (Russia)
- Department of Physics, University of Missouri--Kansas City, Kansas City, Missouri 64110 (United States)
- Center for Advanced Microstructures and Devices, CAMD, Louisiana State University, Baton Rouge, Louisiana 70806 (United States)
- Department of Physics, Tulane University, New Orleans, Louisiana 70118 (United States)
- Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow District 142432 (Russia)
The electronic structure of organic superconductors {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br and {kappa}-(ET){sub 2}Cu(NCS){sub 2} has been studied in detail by means of soft x-ray fluorescence spectroscopy. Cu L{sub 3}, S L{sub 2,3}, C K{alpha}, and N K{alpha} x-ray emission spectra are measured near the corresponding thresholds with synchrotron radiation. The experimental information about site-selective and symmetry-restricted partial density of states in the valence band of both compounds is compared with first-principles band-structure calculations and ultraviolet photoemission spectra. It is found that copper is monovalent in both compounds indicating that the electron is transferred from (ET) dimer to Cu(NCS){sub 2} and Cu[N(CN){sub 2}]Br and is localized mainly on the Cu site. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 690735
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 60; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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