Thermally activated depinning in polycrystalline Bi-based high-Tc superconductors
A. Gupta, P. Esquinazi, H. F. Braun, H.-W. Neumüller
DOI 10.1103/PhysRevLett.63.1869 · Physical Review Letters
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Abstract
With the vibrating-reed technique we have studied the coupling of the flux-line-lattice (FLL) to the atomic lattice between 4.2 and 100 K at constant applied fields 0.014T≤Ba≤4 T in three different Bi-based polycrystalline samples. Depinning of the FLL is observed at temperatures above TD where a peak occurs in the damping of the vibrating sample. With increasing temperature, the FLL dissipation changes at TD from a hysteretic to a viscous regime. The depinning temperature TD<Tc(Ba) follows a logarithmic magnetic field dependence which is similar to the dependence of the depinning temperature T* obtained from measurements of the electrical resistivity due to thermally activated flux motion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
| Bi1.5Pb0.5Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
| Bi1SrCaCu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 62 | Pressure not reported | unknown |
| Bi2.2Sr2Ca0.8Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 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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