Evaluating free flux flow in low-pinning molybdenum-germanium superconducting films
Manlai Liang, Milind N. Kunchur, Jiong Hua, and Zhili Xiao
TL;DR
This study investigates vortex dynamics in molybdenum-germanium superconducting films, demonstrating that they closely follow the free flux flow regime and validating theoretical models beyond the Bardeen-Stephen approximation.
Contribution
It empirically confirms the intrinsic nature of free flux flow in low-pinning superconducting films and tests the validity of advanced theoretical models in this regime.
Findings
Vortex motion aligns with free flux flow at low driving forces.
Results agree with time-dependent Ginzburg-Landau theory.
Provides experimental validation of flux flow theories.
Abstract
Vortex dynamics in molybdenum-germanium superconducting films were found to well approximate the unpinned free limit even at low driving forces. This provided an opportunity to empirically establish the intrinsic character of free flux flow and to test in detail the validity of theories for this regime beyond the Bardeen-Stephen approximation. Our observations are in good agreement with the mean-field result of time dependent Ginzburg-Landau theory. PACS: 74.25.Sv,74.25.Wx,74.25.Uv,74.25.Op,74.25.F- Keywords: vortices, fluxon, Larkin, Ovchinnikov, upper critical magnetic field
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