Abstract
A low-temperature thermodynamic investigation on an organic superconductor κ-(BEDT-TTF)2Ag(CN)2H2O is performed under pressure and with magnetic fields. Using the ac-modulation technique available under pressures, we have succeeded to detect the thermal anomaly being associated with the superconducting transition. The thermal anomaly was found to be sensitive to the external magnetic fields at ambient pressure. We have observed that this anomaly disappears under pressure of 0.4 GPa which suggests that the superconducting ground state is transformed into the normal metallic state by the application of the pressure. The observed feature is consistent with the scenario of Mott-Hubbard physics realized due to the strong electron correlations in the dimerized BEDT-TTF salts.
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