Unusual electronic structure near EF in the organic superconductor κ-[bis(ethylenedithio)tetrathiafulvalene]2Cu[N(CN)2]Br
Rong Liu, H. Ding, J. C. Campuzano, H. H. Wang, J. M. Williams, K. D. Carlson
DOI 10.1103/PhysRevB.51.6155 · Physical Review B
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Abstract
We report on photoemission studies of the quasi-two-dimensional organic superconductor κ-[bis(ethylenedithio)tetrathiafulvalene]2Cu[N(CN)2]Br (Tc=11.6 K). Finite photoelectron-emission intensities were observed in the region close to the Fermi level (EF). However, the spectral line shape displays a broad onset from the Fermi level with a near zero emission intensity at exactly EF. This is in contrast to a sharp Fermi edge that is observed in most three- and two-dimensional metallic systems. The midpoint of the broad emission onset is shifted toward the higher binding-energy side by about 0.1 eV, resulting in an apparent ‘‘gap.’’ Strong electron-electron correlations and the excitation of phonons corresponding to molecular-vibration modes are considered as possible explanations for this unusual spectral behavior. The possible existence of a one-dimensional-like open Fermi surface in this material is discussed.
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 |
| (TMTSF)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | Pressure not reported | unknown |
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