Influence des macles sur le courant critique de transport selon c et sur la ligne d'irreversibilite dans les plans ab etudiee dans des echantillons monodomaines textures d'YBaCuO

摘要

Direct transport measurements at 77 K of the critical current density along the c-axis (J_c) and magnetic measurements are performed on the same bulk textured single domain YBaCuO samples with the longest dimension along the c-axis. A strong influence of the Twin Planes (TP) on J_c and on the ab-plane irreversibility line B (T~*) is reported when the field is rotated in the ab-planes perpendicularly to the c-axis. The different unusual behaviors observed for J_c and the B (T~*) , depending on the range of temperature and field are explained by the strong influence of these extended correlated defects on the pinning of the flux lines.