Resistive dissipation in imperfect crystals of YBa2Cu3O7-δ

We have measured ac magnetoresistance in fields up to 8 T in a variety of YBa2Cu3O7−δ single crystals containing (a) twin boundaries only in one direction, (b) multi-twin domain structure, and (c) growth steps. We find two components of the resistance: an angular dependent Lorentz force induced ‘‘ex...

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Bibliographic Details
Published in:Applied physics letters 1990-09, Vol.57 (12), p.1268-1270
Main Authors: KWOK, W. K, WELP, U, VANDERVOORT, K. G, FANG, Y, CRABTREE, G. W, LIU, J. Z
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:We have measured ac magnetoresistance in fields up to 8 T in a variety of YBa2Cu3O7−δ single crystals containing (a) twin boundaries only in one direction, (b) multi-twin domain structure, and (c) growth steps. We find two components of the resistance: an angular dependent Lorentz force induced ‘‘excess resistivity’’ superimposed on an angular independent resistivity. The temperature and magnetic field dependence of the angular-dependent resistivity exhibit a strong correlation with crystal defects, whereas the angular-independent resistivity remains virtually unchanged. In addition, we find crystals exhibiting both ohmic and non-ohmic behavior in their I-V characteristics depending on crystal imperfections.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.103458