  Magnetic field dependence of low temperature specific heat of spinel oxide
superconductor LiTi_2O_4 has been elaborately investigated. In the normal
state, the obtained electronic coefficient of specific heat gamma_n = 19.15
mJ/mol K2, the Debye temperature is 657 K and some other parameters are
compared with those reported earlier. The superconducting transition at Tc ~
11.4 K is very sharp (DeltaTc ~ 0.3 K) and the estimated delataC/gamma_nTc is ~
1.78. In the superconducting state, the best fit of data leads to the
electronic specific heat C_es/Gamma_nTc = 9.87 exp (-1.58 Tc/T) without field
and gamma(H) ~ H^0.95 with fields. In addition, Hc2(0) ~ 11.7 T, Hc(0) ~ 0.32
T, xi_GL(0) ~ 5.5 nm, lambda_GL(0) ~ 160 nm, and Hc1(0) ~ 26 mT are estimated
from Werthamer-Helfand-Hohenberg (WHH) theory or other relevant relations. All
results from the present study indicate that LiTi2O4 can be well described by a
typical type-II, BCS-like, moderate coupling, and fully gapped superconductor
in the dirty limit. It is further suggested that LiTi2O4 is a moderately
electron-electron correlated system.
