Vortices and DynamicsNo Access

VORTEX STATES AND PEAK EFFECT AT LOW TEMPERATURE IN THICK AMORPHOUS FILMS WITH WEAK PINNING

Research Center for Low Temperature Physics, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8551, Japan

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K. KASHIRO

Research Center for Low Temperature Physics, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8551, Japan

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N. KOKUBO

Center for Research and Advancement in Higher Education, Kyushu University, 4-2-1, Ropponmatsu, Chuoh-ku, Fukuoka 810-0044, Japan

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https://doi.org/10.1142/S0217979207044603Cited by:3 (Source: Crossref)

Abstract

We report on the dynamic as well as static properties of vortices in the low-temperature (T) solid phase of a thick amorphous Mo_xGe_1-x film with weak pinning. The vortex-solid state is considered to be a weakly disordered vortex lattice, which is inferred from the mode-locking resonance over the broad field region. The peak effect of the critical current I_c with magnetic field is clearly visible down to the lowest T measured (0.2 K), which corresponds to 3.3% of the superconducting transition temperature. We find that largest voltage noise originating from current-driven vortices appears in the field region just prior to the peak field at which I_c takes a peak. This is in accord with the result reported in NbSe₂ single crystals.

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