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Electro-transport studies of silver doped FeSe0.94 superconducting system

We present electro-transport studies of polycrystalline FeSe0.94 optimally doped with 6 wt % Ag. The effect of different AC current amplitudes on the superconducting transition and the pinning properties are investigated. Inverse power law dependence of the pinning energy from the applied current is detected, corresponding to a domination of collective pinning / creep of large size vortex bundles. Additionally, using a V-I dynamical (hysteresis type) characteristics, the weak links effects on the vortex dynamics were studied and particularly the temperature dependence of the critical current at close vicinity region near to Tc. There are strong implications for proximity effect (SNS type junctions) induced by Ag-addition grain periphery segregation.