Superconductivity in the charge-density-wave state of the organic metal α-(BEDT-TTF)2KHg(SCN)4
D. Andres, M. V. Kartsovnik, W. Biberacher, K. Neumaier, E. Schuberth, H. Mueller
Abstract
The superconducting transition in the layered organic compound α-(BEDT-TTF)2KHg(SCN)4 has been studied in the two hydrostatic pressure regimes where a charge-density wave is either present or completely suppressed. Within the charge-density-wave state the experimental results reveal a network of weakly coupled superconducting regions. This is especially seen in a strong enhancement of the measured critical field and the corresponding positive curvature of its temperature dependence. Further, it is shown that on lowering the pressure into the density-wave state traces of a superconducting phase already start to appear at a much higher temperature.
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