Magnetic-field, temperature, geometry, and angle-dependent studies of vortex pinning in vibrating high-Tc superconductor crystals
A. Gupta, Y. Kopelevich, M. Ziese, P. Esquinazi, P. Fischer, F. I. Schulz, H. F. Braun
DOI 10.1103/PhysRevB.48.6359 · Physical Review B
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Abstract
From the measurement of the resonance frequency and energy dissipation, we have studied the vortex pinning properties of several vibrating high-Tc superconductor crystals YBa2Cu3O7, Bi2Sr2CaCu2Os+x, and oxygen-reduced Y(6% Gd)Ba2Cu3O6.83. We have studied the response of the crystals under magnetic field (0 T≤B≤8 T), temperature (10 K≤T≤120 K), angle between field and CuO2 planes (0°≤θ≤90°), and for different geometrical arrangements and driving forces. We can understand the enhancement of the resonance frequency with field taking into account the geometry of the crystals and their orientations. In a certain temperature and field range our results indicate that ‘‘Josephson vortices’’ in Bi2Sr2CaCu2O8+x remain pinned. At angles 0°<θ<90° we have measured double dissipation peaks in all the crystals investigated. This effect can be quantitatively understood with the thermally activated depinning and vortex diffusion model using resistivity data from literature. We discuss briefly unique dissipation features measured in Y- and Bi-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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