Suppressed superconductivity of the surface conduction layer in Bi2Sr2CaCu2O8+x single crystals probed by c-axis tunneling measurements
Nam Kim, Yong-Joo Doh, Hyun-Sik Chang, Hu-Jong Lee
DOI 10.1103/PhysRevB.59.14639 · Physical Review B
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Abstract
We fabricated small-size stacks on the surface of Bi2Sr2CaCu2ZO8+x single crystals with the bulk transition temperature Tc≃90 K, each containing a few intrinsic Josephson junctions. Below a critical temperature Tc′(≪Tc), we have observed a weakened Josephson coupling between the CuO2 superconducting double layer at the crystal surface and the adjacent one located deeper inside a stack. The quasiparticle branch in the I-V data of the weakened Josephson junction fits well to the tunneling characteristics of a d-wave superconductor(′)–insulator–d-wave superconductor junction. Also, the tunneling resistance in the range Tc′<T<Tc agrees well with the tunneling in a normal-metal–insulator–d-wave superconductor junction. In spite of the suppressed superconductivity at the surface layer the symmetry of the order parameter appears to remain unaffected.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 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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