Title :
The role of disorder in maximizing the upper critical field in the Nb-Sn system
Author :
Orlando, T.P. ; Alexander, J.A. ; Bending, S.J. ; Kwo, J. ; Poon, S.J. ; Hammond, R.H. ; Beasley, M.R. ; McNiff, E.J., Jr. ; Foner, S.
Author_Institution :
Stanford University, California
fDate :
1/1/1981 12:00:00 AM
Abstract :
We have measured the transition temperature Tc, upper critical field Hc2(T) and the resistivity above Tc, ρTc, for thin films of electron beam co-evaporated Nb-Sn which were deposited as Nb3Sn at various substrate temperatures, or off-stoichiometry, or with tertiary additions of Al or Zr. The Tcand Hc2correlate with the resistivity, no matter how the materials were made. A maximum Hc2(0) of about 300 kOe occurs when ρTc∼ 30 μΩ-cm and the corresponding Tc∼ 16 K; also Hc2shows no sign of Pauli limiting.
Keywords :
Superconducting materials; Conductivity; Laboratories; Magnetic field measurement; Niobium-tin; Superconducting magnets; Superconducting transition temperature; Superconductivity; Temperature measurement; Tin; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1981.1061041
