  A systematic study is performed on the spinel oxide, i.e. LiTi2O4 thin films
oriented along [111]-, [110]-, and [001]-directions, to reveal the
crystallographic dependence of transport properties. With decreasing
temperature, the LiTi2O4 displays roughly identical onset temperatures of
twofold symmetry of in-plane angular dependent magnetoresistivity (AMR) (at ~
100 K), crossover from negative- to positive- magnetoresistance (at ~ 50 K),
and coherence length in the superconducting state. While, the twofold symmetry
in AMR itself suggests anisotropic electron scattering. The superconducting
transition temperature (Tc) seems insensitive to the lattice parameter.
Moreover, the spherical aberration-corrected scanning transmission electron
microscopy (Cs-STEM) discloses that oxygen vacancies exist in the LiTi2O4
films. These oxygen vacancies cause the change of lattice but show little
influence on superconductivity, differing from high-Tc cuprates where subtle
variation of oxygen way lead to a significant change in superconductivity.
