Dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films
Wei Liu, Minsoo Kim, G. Sambandamurthy, N. P. Armitage
DOI 10.1103/PhysRevB.84.024511 · Physical Review B
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Abstract
We report a comprehensive study of the complex ac conductance of amorphous superconducting InOx thin films. We measure the explicit frequency dependency of the complex conductance and the phase stiffness over a range from 0.21 to 15 GHz at temperatures down to 350 mK using a novel broadband microwave Corbino spectrometer. The dynamic ac measurements are sensitive to the temporal correlations of the superconducting order parameter in the fluctuation range above Tc. Among other aspects, we explicitly demonstrate the critical slowing down of the characteristic fluctuation rate on the approach to the superconducting state and show that its behavior is consistent with vortex-like phase fluctuations and a phase-ordering scenario of the transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| InOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.36 | Pressure not reported | zero_resistance |
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