Vortex-glass superconductivity in a typical weak-link YBa2Cu3O7−y/SiO2 system
Y. Zhao, X. B. Zuge, J. M. Xu, L. Cao
DOI 10.1103/PhysRevB.49.6985 · Physical Review B
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Abstract
Vortex-glass superconductivity is studied in an extreme weak-link system of YBa2Cu3O7−y/SiO2 composite by measuring the I-V curve in a series of low magnetic fields. The feature of the vortex-glass transition, i.e., the changes of the curvature of the I-V curves from the positive to negative are observed and the equilibrium phase boundary line between the normal and superconducting phases in the H-T plane is obtained. In the magnetic field lower than 135 Oe, the system shows a magnetic-field-independent scaling behavior; but a magnetic-field-dependent scaling behavior is observed in higher fields. A relatively low value of the dynamical exponent z suggests that the dynamics of vortex glass in the weak-link network system is different from that in the superconducting single-crystal system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | onset |
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