Room-temperature single-electron charging and surface polarization in tunneling spectroscopy of high-Tc superconducting thin films
R. T. Kao, S. J. Wang, S. P. Chen, J. Y. Juang, K. H. Wu, T. M. Uen, Y. S. Gou
DOI 10.1103/PhysRevB.58.11207 · Physical Review B
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Abstract
The tunneling spectroscopy of both YBa2Cu3O7−δ (YBCO) and TlBa2Ca2Cu3O9±δ (Tl-1223) superconducting thin films was studied using scanning tunneling microspectroscopy. The marked staircase structure in the current-voltage characteristics showed the manifestation of single-electron charging of two series-coupled mesoscopic tunnel junctions. For YBCO films, the step width across the zero-bias voltage (ΔV0) was larger than that of other steps (ΔVn), with ΔV0≅1.5ΔVn, as the bias voltage exceeded a threshold value. Such a step-widening anomaly, however, was not seen in Tl-1223 films. Preliminary surface polarization measurements showed that the polarization is much more hysteretic for YBCO than for Tl-1223 films, suggesting that the anomalous widening of ΔV0 may originate from the polarization-induced residual charging effect.
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 | zero_resistance |
| TlBa2Ca2Cu3O9±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | unknown |
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