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11 June 2007Noise in superconducting MgB2 thin film
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
Sv = 0.34nVHz1/2 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.