Anomalous vortex flow and noise in the quantum liquid phase of amorphous films

✍ Scribed by S. Okuma; K. Kainuma; T. Kishimoto

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 387 KB
• Volume: 437-438
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2005.12.050

✦ Synopsis

We measure the fluctuating component of the flux-flow voltage, dV(t), about the average voltage in the low-temperature (T) liquid phase of amorphous Mo x Si 1Àx films. For the 100-nm-thick film dV(t) originating from the vortex motion is clearly visible in the quantum-vortex-liquid (QVL) phase, where the distribution of dV(t) is asymmetric, suggestive of the unusual vortex motion. For the thin (6 and 4 nm) films, in which the QVL phase is not determined from the T dependence of the resistance, the similar unusual (avalanche-like) vortex motion is observed in nearly the same reduced-T regime. These results support the view that vortex dynamics in the low-T liquid phase of thick and thin films is dominated by common physical mechanisms related to quantum-fluctuation effects.