Optical properties of β″−(ET)2SF5CH2CF2SO3: A layered molecular superconductor with large discrete counterions
J. Dong, J. L. Musfeldt, J. A. Schlueter, J. M. Williams, P. G. Nixon, R. W. Winter, G. L. Gard
DOI 10.1103/PhysRevB.60.4342 · Physical Review B
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Abstract
We report the polarized infrared and optical reflectance of β″−(ET)2SF5CH2CF2SO3 as a function of temperature. This fully organic superconductor displays weakly metallic behavior over the entire temperature range of our investigation. The electronic properties present several unusual features including the lack of a conventional free carrier (Drude) response at low temperature, infrared localization phenomena, and an unexpected temperature dependence of the oscillator strength. Similar behavior is observed in other β and β″ superconductors above Tc, suggesting that this class of compounds is very close to a metal → insulator transition where electronic correlations are important and the Drude response carries very little spectral weight. Vibronic features increase in intensity with decreasing temperature in the infrared, as expected. The temperature dependence of key anion vibrational modes are discussed in terms of intermolecular hydrogen bonding within the anion pocket.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (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 not reported | unknown |
| (ET)2Cu(N(CN)2)Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.8 | 0.03 GPa | unknown |
| (ET)2SF5CH2CF2SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure not reported | unknown |
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