Onset of high-temperature superconductivity in the two-dimensional limit
T. Wang, K. M. Beauchamp, D. D. Berkley, B. R. Johnson, J.-X. Liu, J. Zhang, A. M. Goldman
DOI 10.1103/PhysRevB.43.8623 · Physical Review B
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Abstract
The transition between insulating and superconducting behavior in the low-temperature limit has been explored with use of ultrathin Dy-Ba-Cu-O c-axis-oriented films prepared by molecular-beam epitaxy. The transition appears as a separatrix between sets of R(T) curves that exhibit either insulating or superconducting behavior in the T→0 limit. Superconductivity is found only when the normal-state sheet resistance is below a value close to h/4e2, or 6450 Ω. Hall-effect data relate the depression of Tc with increasing sheet resistance to a reduction in hole concentration.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| DyBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| DyBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | zero_resistance |
| DyBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | zero_resistance |
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