Abstract
The paper points out similarities in the features observed in the resistivity vs temperature behaviour of compacted powder samples of the two low carrier density superconducting systems viz. Chevrel phase compounds (CPC) and the high Tc oxides (HTSC). Quasi-hydrostatic pressures upto 10 GPa were employed on the samples for these studies. Specifically CuM06S8, AgM0S8, YBa2Cu307 and HoBa2Cu307 were studied. The common feature is the broadening of the resistive superconducting transition to a considerable extent in the CPC and the complete loss of transition in the HTSC. It is argued that weak intergranular coupling (IGC) is responsible for the observed behaviour in both these systems and may account for the poor transport current densities observed in bulk materials.
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