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Anisotropic phase diagram at higher temperature for Tl2Ba2CaCu2O8 thin film

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By measuring the temperature dependence of the magnetoresistivity of Tl2Ba2CaCu2O8 thin films, two superconducting transitions were observed for field orientations in the [iopmath latex="$H\perp ab$"] Hab [/iopmath] - and [iopmath latex="$H\parallel ab$"] Hab [/iopmath] -planes. The transition at the high temperature ( [iopmath latex="$T_{ch}$"] Tch [/iopmath] ) corresponds to a steep peak in the derivative of the effective activation energy and shifts very moderately with increasing magnetic field. The transition is in good agreement with the value of the upper critical field derived from critical fluctuation theory. Meanwhile, the transition at low temperature ( [iopmath latex="$T_{cl}$"] Tcl [/iopmath] ) was associated with the Josephson coupling and strong intrinsic pinning for the two field orientations, respectively. This is consistent with the different magnetic field dependence of the activation energy calculated from the experimental data between [iopmath latex="$T_{ch}$"] Tch [/iopmath] and [iopmath latex="$T_{cl}$"] Tcl [/iopmath] .

Document Type: Miscellaneous

Affiliations: 1: Department of Physics and National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210008, People's Republic of China 2: Department of Electronics, Nankai University, Tianjin 300071, People's Republic of China 3: Department of Electronics, Nanjing University, Nanjing 210008, People's Republic of China

Publication date: July 1, 2001


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