Abstract
Voltage noise SV(f) generated by current‐driven vortices is studied as a function of flow voltage V and magnetic field for a superconducting amorphous MoxGe1−x film. For high V (or velocity) in the flux‐flow state, SV at low frequency (f = 100 Hz) exhibits a sharp peak just below a peak field of the critical current. For low V in the plastic‐flow state, an additional broad peak of SV appears at lower field. Possible origin responsible for large flow noise is discussed. We show that for moderate V, SV clearly detects the structural phase transition of vortex matter.
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