STUDY ON VORTEX DYNAMICS OF Tl₂Ba₂CaCu₂O₁₀ THIN FILM IN TILTED MAGNETIC FIELDS

Abstract

Tl 2 Ba 2 CaCu 2 O 10 ( Tl :2212) thin films were prepared on LaAlO 3 substrates with (0 0 1) direction normal to their surface, and the logR-logH characteristics were measured using the in-plane resistivity measurements in magnetic fields tilted away from c axis to the ab-plane. The H * c - H ab phase diagram was obtained by defining a resistance criterion below the vortex phase melting transition resistance. The linear dependence of H * c on H ab in most angular range shows that the crossing-lattice structure in the tilted fields exists in Tl :2212. A perpendicular line was observed in the H * c - H ab diagram at the range of θ ¡ 0.4 ° at 88K, which was attributed to the lock-in transition.