Unusual thickness dependence of the superconducting transition of α-MoGe thin films
H. Tashiro, J. M. Graybeal, D. B. Tanner, E. J. Nicol, J. P. Carbotte, G. L. Carr
DOI 10.1103/PhysRevB.78.014509 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Thin films of α-MoGe show progressively reduced Tc’s as the thickness is decreased below 30 nm and the sheet resistance exceeds 100 Ω/◻. We have performed far-infrared transmission and reflection measurements for a set of α-MoGe films to characterize this weakened superconducting state. Our results show the presence of an energy gap with ratio 2Δ0/kBTc=3.8±0.1 in all films studied, slightly higher than the BCS value, even though the transition temperatures decrease significantly as film thickness is reduced. The material properties follow BCS-Eliashberg theory with a large residual scattering rate but the expected coherence peak seen in the optical scattering rate is lost in the thinner samples. This result cannot be explained within conventional theories.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| MoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure not reported | onset |
| MoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | onset |
Similar papers
Resistive transitions of thin film superconductors in a magnetic field
similarity 0.97M. H. Theunissen & P. H. Kes
Source status unknown — claims are unverified
Observation of an extended magnetic field penetration in amorphous superconducting MoGe films
similarity 0.96Taichiro Nishio et al.
Source status unknown — claims are unverified
Superconductor/ferromagnet bilayers: Influence of magnetic domain structure on vortex dynamics
similarity 0.96A. Belkin et al.
Source status unknown — claims are unverified
The unusual thickness dependence of superconductivity in -MoGe thin films
similarity 0.95H. Tashiro et al. · 2008 · arXiv:0803.1185
Source status unknown — claims are unverified
Observation of a new universal resistive behavior of two-dimensional superconductors in a magnetic field
similarity 0.95J. M. Graybeal & M. R. Beasley
Source status unknown — claims are unverified
Dissipation Effects on the Superconductor-Insulator Transition in 2D Superconductors
similarity 0.95N. Mason & A. Kapitulnik
Source status unknown — claims are unverified