Current noise in MgB_2 superconducting thin films

摘要

In this paper we present some experimental results concerning the current noise produced during the resistive transition in MgB_2 thin films. Preliminary investigations evidenced the presence of electrical noise whose power spectrum has a region of the I/f~n type with n～3. We suggest that the noise may originate from abrupt rearrangement of the current distribution inside the specimen during the percolative process of a diphasic system. Experimental measurements of the spectral components of the current noise taken during the resistive transition will be given and discussed.