Noise in MgB_2 thin film- a candidate material for space-borne infrared detector development

摘要

An MgB_2 thin film was grown on a SiN-Si substrate, with a superconducting transition temperature, T_c, near 39K. At the mid-point of the transition (T = 38.24K) and at 10Hz a noise spectral density S_V = 0.34nV/(Hz)~(1/2_ was measured. The temperature noise, K_n , of the MgB_2 film at different frequencies is compared to that of cuprate high temperature superconducting (HTS) thin films (with T_c ～ 90 K) used currently in transition-edge bolometers. K_n values predict that high performance far-IR thermal detectors (i.e bolometers) can be developed using MgB_2 as a thermistor.