The Normal State Resistivity of Grain Boundaries in YBa2Cu3O7-delta
J.H.T. Ransley (1), S.H. Mennema (1), K.G. Sandeman (1), G. Burnell, (1), J.I. Kye (2), B. Oh (2), E.J. Tarte (1), J.E. Evetts (1), M.G., Blamire (1) ((1) IRC in Superconductivity, Cambridge, UK, (2) LG Electronics, Institute of Technology, Seoul, Korea)
TL;DR
This study measures the temperature-dependent resistance of YBa2Cu3O7-delta grain boundaries above Tc, revealing how grain boundary angle influences resistance changes and enabling estimation of the potential barrier height at the interface.
Contribution
It introduces an optimized measurement method for grain boundary properties above Tc and analyzes the results using band-bending theory to estimate barrier heights.
Findings
Resistance change strongly depends on grain boundary angle.
Barrier height can be estimated from resistance data.
Results enhance understanding of grain boundary effects in superconductors.
Abstract
Using an optimized bridge geometry we have been able to make accurate measurements of the properties of YBa2Cu3O7-delta grain boundaries above Tc. The results show a strong dependence of the change of resistance with temperature on grain boundary angle. Analysis of our results in the context of band-bending allows us to estimate the height of the potential barrier present at the grain boundary interface.
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