Resistive dissipation in imperfect crystals of YBa2Cu3O7 - delta
Abstract
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- September 1990
- DOI:
- 10.1063/1.103458
- Bibcode:
- 1990ApPhL..57.1268K
- Keywords:
-
- Crystal Structure;
- Dissipation;
- High Temperature Superconductors;
- Mixed Oxides;
- Yttrium Oxides;
- Barium Oxides;
- Copper Oxides;
- Crystal Defects;
- Magnetoresistivity;
- Single Crystals;
- Volt-Ampere Characteristics;
- Solid-State Physics