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MgB2 superconducting films for bolometer applications

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5 Author(s)
Monticone, E. ; Inst. Elettrotecnico Nazionale "Galileo Ferraris", Torino, Italy ; Rajteri, M. ; Portesi, C. ; Bodoardo, S.
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Thin superconducting films of MgB2 has been prepared on r-plane sapphire and silicon nitride (SiN) by ex-situ technique and co-deposition of B and Mg at several substrate temperatures with the aim to fabricate superconducting bolometers. MgB2 films on r-plane sapphire, realized by annealing of a B film at 890°C, show a Tc=38 K and RRR=2 while no transition has been observed for MgB2 films on SiN above 5 K treated in the same way. A reliable process of MgB2 growth on SiN with Tc between 27 K and 30 K and transition width of 0.5 K has been performed by co-deposition Mg and B and following annealing to 600°C.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )