Logarithmic current density dependence of the activation barrier in superconducting HgBa2CaCu2O6+x
S. Gjo/lmesli, K. Fossheim, Y. R. Sun, J. Schwartz
DOI 10.1103/PhysRevB.52.10447 · Physical Review B
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Abstract
We report relaxation measurements of the nonequilibrium magnetic moment mj(t) with B∥ to the c axis in a grain aligned sample of the HgBa2CaCu2O6+x high-temperature superconductor. The nonlinear curent density dependence of the activation barrier U(j) is extracted from the mj(t) data, and it is found that U(j) is well described by U(j)=Ucln(jc/j). We also find the field dependence of the parameters Uc and jc. The creep rate d ln(mj)/d ln(t) is found to be a monotonically increasing function of T, reaching a finite value at low T, in the quantum creep regime.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CaCu2O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 127 | Pressure unresolved | onset |
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