Anisotropy of the penetration depth in YBa2Cu3O7−δ: Josephson-tunneling studies
A. G. Sun, S. H. Han, A. S. Katz, D. A. Gajewski, M. B. Maple, R. C. Dynes
DOI 10.1103/PhysRevB.52.R15731 · Physical Review B
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Abstract
The modulation of the Josephson critical current between two superconductors in a magnetic field provides a direct, low-field dc measurement of the penetration depth of the two superconductors. To measure the in-plane penetration depth anisotropy of YBa2Cu3O7−δ, we have fabricated low leakage Pb/Insulator/YBa2Cu3O7−δ tunnel junctions on detwinned YBa2Cu3O7−δ single crystals with tunneling along the c axis. By applying the magnetic field along the b and a crystalline axes of YBa2Cu3O7−δ, λa and λb are extracted from the respective field modulation patterns. We find a large anisotropy [(λaλb)2>~2] of the penetration depths along the a and b axes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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