Bi2Sr2CaCu2O8+δ Bicrystal c-Axis Twist Josephson Junctions: A New Phase-Sensitive Test of Order Parameter Symmetry
Qiang Li, Y. N. Tsay, M. Suenaga, R. A. Klemm, G. D. Gu, N. Koshizuka
DOI 10.1103/PhysRevLett.83.4160 · Physical Review Letters
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Abstract
We prepared atomically clean Bi2Sr2CaCu2O8+δ Josephson junctions between identical single crystal cleaves stacked and twisted an angle φ0 about the c axis. For each bicrystal, the ratio JcJ/JcS of the c axis twist junction critical current density to that across either single crystal part is unity, independent of φ0 and the ratio AJ/AS of junction areas. Our results provide strong evidence for incoherent c-axis tunneling and that the dominant superconducting order parameter contains an isotropic s-wave component for T≤Tc, but not the purported dx2−y2-wave component.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
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