Enhanced magnetic quantum oscillations in the mixed state of a two-dimensional organic superconductor
J. Wosnitza, J. Hagel, P. J. Meeson, D. Bintley, J. A. Schlueter, J. Mohtasham, R. W. Winter, G. L. Gard
DOI 10.1103/PhysRevB.67.060504 · Physical Review B
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Abstract
We report on de Haas–van Alphen (dHvA) oscillations observed in the mixed state of the organic superconductor β″-(BEDT−TTF)2SF5CH2CF2SO3 (BEDT-TTF stands for bisethylenedithio-tetrathiafulvalene) utilizing the field-modulation technique and torque magnetometry. At low temperatures (30 mK), the dHvA signal persists down to 1.4 T well below the upper critical field Bc2≈3.6T. Contrary to most theoretical predictions and previous experimental findings, no additional damping of the dHvA-oscillation amplitude, but a reduced damping of the dHvA signal is found. This highly unusual effect might indicate a reduced quasiparticle scattering rate or an additional oscillatory contribution in the superconducting state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| β″-(BEDT-TTF)2SF5CH2CF2SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure unresolved | unknown |
| β″-(BEDT-TTF)2SF5CH2CF2SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure unresolved | unknown |
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