Vortex flow and shot noise in the quantum-liquid phase of thick amorphous superconducting films
S. Okuma, K. Kainuma, M. Kohara
DOI 10.1103/PhysRevB.74.144509 · Physical Review B
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Abstract
We measure the fluctuations (noise) of the vortex-flow voltage in the low-temperature liquid phase of thick amorphous (a−)MgxB1−x and a−MoxSi1−x films with different transition temperatures and widths of the quantum-vortex-liquid (QVL) phase. An anomalous vortex flow with an asymmetric distribution of (real-time) voltage fluctuations is commonly observed in the QVL phase, independent of material as well as strength of quantum fluctuations. In the QVL phase we observe the Lorentzian-type noise spectra indicative of shot noise, whose origin is attributed to the vortex bundles that are depinned and pinned randomly in the stationary flow of QVL.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoxSi1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.86 | Pressure not reported | onset |
| MgxB1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.58 | Pressure not reported | onset |
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