The Anisotropic Upper Critical Field of Single Crystal YBa<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub>
Yasuhiro IyeThe Institute for Solid State Physics, The University of TokyoT. TamegaiThe Institute for Solid State Physics, The University of TokyoHiroyuki TakeyaThe Institute for Solid State Physics, The University of TokyoHumihiko TakeiThe Institute for Solid State Physics, The University of Tokyo
1987en
ABI
Аннотация
We report a study of anisotropic upper critical field of single crystal samples of orthorhombic YBa 2 Cu 3 O x . The critical field shows anisotropy characteristic of a quasi-two-dimensional superconductor, and is highest when the field is oriented perpendicular to the c -axis. For this field direction, the zero resistance state persists up to 86 K in a magnetic field of 90 kOe, which is lower by only 5 K than the zero resistance temperature in the absence of magnetic field. The anisotropy H c2 ⊥ / H c2 // is about 2 at 90 K, 5 at 86.5 K and tends to increase with decreasing temperature.
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