Magnetic relaxation and quantum tunneling of vortices in a polycrystalline Hg0.8Tl0.2Ba2Ca2Cu3O8+δ superconductor
X. X. Zhang, A. García, J. Tejada, Y. Xin, G. F. Sun, K. W. Wong
DOI 10.1103/PhysRevB.52.1325 · Physical Review B
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Abstract
Magnetic relaxation in a polycrystalline Hg0.8Tl0.2Ba2Ca2Cu3O8+δ [(Hg,Tl)-1223] superconductor was measured in the temperature range 1.85–20 K with different magnetic fields applied during the cooling process. The relaxation curves show a nearly perfect linear ln(t) behavior. The temperature dependence of the normalized relaxation rate, R≡‖d(M/M0)/dln(t)‖, was studied for two applied magnetic fields. With the lower applied field (Ha=3 kOe), a temperature-independent R is found below 2.1 K and explained in terms of quantum tunneling of vortices. As the applied field increases (Ha=10 kOe), the transition from the thermal to the quantum regime is not found in the experimentally accessible temperature range above 1.85 K. The field dependence of R at 2.8 K is studied in order to analyze the dimensionality of the flux-line lattice.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Hg0.8Tl0.2Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 138 | Pressure unresolved | zero_resistance |
| Hg0.8Tl0.2Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133.5 | Pressure not reported | onset |
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