Robust superconductivity in quantum-confined Pb: Equilibrium and irreversible superconductive properties
Mustafa M. Özer, James R. Thompson, Hanno H. Weitering
DOI 10.1103/PhysRevB.74.235427 · Physical Review B
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Abstract
Strong quantum size effects enable the formation of crystalline Pb films that are atomically flat on a macroscopic length scale. The superconducting properties of 5–18–monolayer-(ML) thick Pb films were investigated in a superconducting quantum interference device (SQUID) magnetometer using combined ac and dc methods. Even the thinnest films (5 ML) are extraordinarily robust type-II superconductors. Despite the extreme two-dimensional geometry, the thermodynamic parameters Tc and upper critical field Hc2 are primarily controlled by the physical boundary conditions of the film and show no evidence for disorder-driven or fluctuation-driven quenching of superconductivity. A magnetically hard critical state is established as a consequence of vortex trapping by quantum growth defects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | onset |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure not reported | onset |
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