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Capacitance as a probe of high angle grain boundary transport in oxide superconductors

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9 Author(s)
Tarte, E.J. ; Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK ; McBrien, P.F. ; Ransley, J.H.T. ; Hadfield, R.H.
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We report a series of studies of grain boundary (GB) capacitance for YBa2Cu3O7-δ (YBCO) films grown on SrTiO3 (STO) bicrystal substrates. By varying the film thickness and the width of the track containing the GB, we find that the substrate makes no contribution to the capacitance measured using Fiske resonances or hysteresis in most cases. This is due to the frequency dependence of the dielectric properties of SrTiO3. We have also found that GB capacitance per unit area cGB correlates with the resistance-area product RnA. For our own GBs and GBs reported in the literature the data is is consistent with c GB∝(RnA)-1. We attribute this to variations in GB barrier properties, which reduce the active area, whilst maintaining locally the transport mechanism as tunneling

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )

Date of Publication:

Mar 2001

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