Interfacial effects and superconductivity in high-Tc materials
S. Vieira, P. Zhou, S. A. Solin, N. Garcia, M. Hortal, A. Aguilo
DOI 10.1103/PhysRevB.39.334 · Physical Review B
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Abstract
A series of quasihomogeneous superconducting powders of YBa2Cu3O7−x have been prepared by sieving and characterized by electron microscopy and x-ray diffraction. Quantitative size-dependent and temperature-dependent magnetic levitation and susceptibility measurements of random powders and of field-oriented (at T<Tc=92 K) small grains (<20 μm) confirm previously observed symmetry-breaking effects associated with the twin boundary planes and suggest that the bulk anisotropic superconductivity is measurably perturbed by interfacial effects. Current models of interfacial superconductivity in high-Tc materials are evaluated in light of these and other results and are found to be lacking.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
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