Infrared optical properties of the 10-K organic superconductor (BEDT-TTF)2[Cu(NCS)2] [where (BEDT-TTF) is bis(ethylenedithio)tetrathiafulvalene]
K. Kornelsen, J. E. Eldridge, Hau H. Wang, Jack M. Williams
DOI 10.1103/PhysRevB.44.5235 · Physical Review B
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Abstract
Low-temperature polarized bolometric absorption measurements have been performed on the Tc=10.4 K organic superconductor κ-(BEDT-TTF)2[Cu(NCS)2], where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. The ratio of the absorption at 5.3 K to that at 10.5 K from 10 to 40 cm−1 showed no evidence of a conventional BCS gap. Polarized-reflectivity measurements at temperatures between 10 and 295 K are also reported for both the protonated and deuterated compounds, between 200 and 8000 cm−1. The 10-K spectra were calibrated by a technique of simultaneously measuring the reflectivity R and the absorptance, 1-R. The resulting conductivities display vibrational features superimposed on an electronic background. This background shifts from mid-infrared interband transitions, when the dc conductivity is low, to far-infrared intraband transitions as the dc conductivity increases. The vibrations have been assigned to a mixture of normally inactive ag modes and normally active b2u modes of the BEDT-TTF molecule. A few of both types couple strongly to the charge carriers. One in particular has a very temperature-dependent frequency due to the changing intensity of the mid-infrared band.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2[Cu(NCS)2] Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure unresolved | unknown |
| (BEDT-TTF)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 |
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