Effect of ionizing radiation on noise in MgB2 thin film – a candidate material for detector development for post-Cassini planetary missions
✍ Scribed by B. Lakew; S. Aslam; H. Jones; B. Moeckly; J. Brasunas; D. Franz
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 565 KB
- Volume
- 440
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
A thin film of MgB 2 , grown on a SiN-Si substrate, with a superconducting transition temperature, T c , near 39 K has been irradiated with c-rays from a 60 Co source. The total dose was 100 Krads (Si). Its pre-and post-irradiation noise has been measured and noise spectral density plots made. No change in dR/dT, pre-and post-irradiation was measured. At the mid-point of the transition, T = 38.24 K, a noise spectral density S V = 0.34 nV Hz À1/2 was measured at 10 Hz. The temperature noise, K n , of the MgB 2 film at different frequencies is compared to that of high temperature superconducting (HTS) thin films (YBaCuO and GdBaCuO with T c $ 90 K) used currently in HTS transition-edge bolometers. Even with the observed post-irradiation small increase in noise, its lower T c and K n values predict that high performance far IR bolometers can be developed using MgB 2 as a thermistor.