Electronic structure of organic superconductors {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br, {kappa}-(ET){sub 2}Cu(NCS){sub 2}, and {beta}-(ET){sub 2}I{sub 3} studied by photoelectron spectroscopy
- Materials Science and Chemistry Divisions, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
Photoemission studies were carried out on three organic superconductors: {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br, {kappa}-(ET){sub 2}Cu(NCS){sub 2}, and {beta}-(ET){sub 2}I{sub 3}. In all three compounds, we observe a valence band that extends from the Fermi level to approximately 22 eV below, showing many distinguishable features. A metallic Fermi edge is not observed in any of the three compounds. The orbital characteristics of some spectral features are deduced through variations in the excitation photon energy and observations of the relative intensity variations. For {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br and {beta}-(ET){sub 2}I{sub 3}, comparisons were made between the measured spectra and the densities of states calculated by use of first-principles self-consistent methods. Some core-level spectra are presented.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 69922
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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