Field-Induced Metal-Insulator Transition in a Two-Dimensional Organic Superconductor
J. Wosnitza, S. Wanka, J. Hagel, H. v. Löhneysen, J. S. Qualls, J. S. Brooks, E. Balthes, J. A. Schlueter, U. Geiser, J. Mohtasham, R. W. Winter, G. L. Gard
DOI 10.1103/PhysRevLett.86.508 · Physical Review Letters
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Abstract
The quasi-two-dimensional organic superconductor β′′−(BEDT−TTF)2SF5CH2CF2SO3 (Tc≈4.4K) shows very strong Shubnikov–de Haas (SdH) oscillations which are superimposed on a highly anomalous steady background magnetoresistance, Rb. Comparison with de Haas–van Alphen oscillations allows a reliable estimate of Rb which is crucial for the correct extraction of the SdH signal. At low temperatures and high magnetic fields insulating behavior evolves. The magnetoresistance data violate Kohler's rule, i.e., cannot be described within the framework of semiclassical transport theory, but converge onto a universal curve appropriate for dynamical scaling at a metal-insulator transition.
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 not reported | unknown |
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