Electronic structure of organic superconductors κ-(ET)2Cu[N(CN)2]Br, κ-(ET)2Cu(NCS)2, and β-(ET)2I3 studied by photoelectron spectroscopy
Rong Liu, H. Ding, J. C. Campuzano, H. H. Wang, J. M. Williams, K. D. Carlson
DOI 10.1103/PhysRevB.51.13000 · Physical Review B
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Abstract
Photoemission studies were carried out on three organic superconductors: κ-(ET)2Cu[N(CN)2]Br, κ-(ET)2Cu(NCS)2, and β-(ET)2I3. 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 κ-(ET)2Cu[N(CN)2]Br and β-(ET)2I3, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.6 | Pressure unresolved | unknown |
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
| β-(ET)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | unknown |
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