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Abstract
The measurement of the normalized noise power spectral density (Sn(f)=Sv(f)/V2) of the YBCO microbridge sows 1/falpha dependence. The key features of the present measurements are as follows: in the normal state, Sn(f) is several orders of magnitude larger than the value predicted by Hooge (1969); near Tc, Sn(f) increases by several orders of magnitude and alpha approaches 2; the noise power increases in a magnetic field near Tc. This enhancement of Sn(f) seems to be related to fluctuation at the phase transition due to the instability of Cooper pair formation and breaking.
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