Noise in superconducting MgB_2 thin film

摘要

Noise was studied in an MgB2 thin film grown on a SiN substrate, with a superconducting transition temperature, Tc , near 39K. At the mid-point of the transition and at 10Hz a noise spectral density S_v = 0.34nVHz~(1/2) was measured. The temperature noise, Kn , of the MgB2 film at different frequencies is compared to that of cuprate high temperature superconducting (HTS) thin films (with Tc～90 K) used currently in transition-edge devices. Kn values predict that 2-D arrays of high performance infrared devices can be developed using MgB2.