Investigation of the interface problem between high temperature superconductor and ionic conductors
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The charge carriers transfer process across the interface between a superconductor and an ionic conductor, around Tc is investigated. Low temperature electrochemical measurements are carried out on the interfaces between different polycrystalline high-Tc superconductors (HTSC) and RbAg4l5 and Ag+ ion-conducting glass. The experiments cover a temperature range down to 10 K in the de-frequency range. Atransient technique in the time domain and electrochemical impedance spectroscopy (EIS) in the frequency domain are used to study the silver (Ag+) deposition as the Faradaic charge transfer process at that interface. The results show significant enhancement of the charge transfer observed around the critical temperature. This was indicated by either an admittance peak in the transient measurements or a corresponding decrease of the polarization resistance (Rp) in EIS measurements. This enhancement of the charge transfer is correlated to the formation of Cooper pairs at T ⩽ Tc and interpreted on the basis of a band structure model as a quantumelectrochemical phenomenon with the tunnelling of Cooper pairs through the electrochemical double layer.
KeywordsCharge Transfer Critical Temperature Ionic Conductor Electrochemical Impedance Spectroscopy Electrochemical Impedance Spectroscopy
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