Magnetic Field Enhanced Order Parameter Amplitude Fluctuations in Ultrathin Films near the Superconductor-Insulator Transition
Shih-Ying Hsu, J. A. Chervenak, J. M. Valles, Jr.
DOI 10.1103/PhysRevLett.75.132 · Physical Review Letters
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Abstract
A magnetic field tuned superconductor-insulator transition (SIT) in ultrathin PbBi/Ge films has been observed. Electron tunneling measurements in a magnetic field near the SIT show the presence of a large number of quasiparticle states near the Fermi energy. A simple analysis of these data shows that the average number of Cooper pairs in a coherence volume is on the order of 1 at the SIT. Combined with transport measurements, the data imply that strong fluctuations in the amplitude of the superconducting order parameter occur at this field tuned SIT.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.96 | Pressure not reported | midpoint |
| Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.12 | Pressure not reported | midpoint |
| Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.28 | Pressure not reported | midpoint |
| Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.64 | Pressure not reported | midpoint |
| Pb0.9Bi0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.5 | Pressure not reported | midpoint |
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