Paramagnetic limiting in superconducting LiTiO ternary system

Measurements of upper critical fields H_c2 vs temperature are presented for several LiTiO compounds which have a nearly constant T_c = 11.2 ± 0.3 K and widely varying values of H_c2. Stable compounds have small spin-orbit scattering and show paramagnetic limiting effects, with the highest H_c2(4.2K) = 162 kG. Several compounds with large scattering showed a decrease in H_c2 over a period of about one year.