Dislocation description of twins in high-temperature superconductor YBa2Cu3O7-d

Анотація

The thin twins theory consistently applied to the dislocation description of twins in the high-temperature superconductor YBa₂Cu₃O_7-d (YBCO). Quantitative analysis of the twin shape shows an agreement with theoretical consideration and gives new method to evaluate the twin boundary energy g_tw. Friction stress S_fr acting on a twinning dislocation is also determined. The formation of a twin and twin microstructures are analyzed. The principles of microstructure design by twinning in YBCO crystals for enhanced J_c at high magnetic fields are discussed.