  Here, we demonstrate an interplay between superconducting fluctuations and
electron-electron interaction (EEI) by low temperature magnetotransport
measurements for a set of 2D disordered TiN thin films. While cooling down the
sample, a characteristic temperature T* is obtained from the R(T) at which
superconducting fluctuations start to appear. The upturn in R(T) above T*
corresponds to weak localization (WL) and/or EEI. By the temperature and field
dependences of the observed resistance, we show that the upturn in R(T)
originates mainly from EEI with a negligible contribution from WL. Further, we
have used the modified Larkins electron-electron attraction strength
beta(T/Tc), containing a field induced pair breaking parameter, in the
Maki-Thompson (MT) superconducting fluctuation term. Here, the temperature
dependence of the beta(T/Tc) obtained from the magnetoresistance analysis shows
a diverging behavior close to Tc and it remains almost constant at higher
temperature within the limit of ln(T/Tc) < 1. Interestingly, the variation of
beta(T/Tc) on the reduced temperature (T/Tc) offers a common trend which has
been closely followed by all the concerned samples presented in this study.
Finally, the temperature dependence of inverse phase scattering time , as
obtained from the magnetoresistance analysis, clearly shows two different
regimes; the first one close to Tc follows the Ginzburg-Landau relaxation rate
, whereas, the second one at high temperature varies almost linearly with
temperature indicating the dominance of inelastic electron-electron scattering
for the dephasing mechanism. These two regimes are followed in a generic way by
all the samples in spite of being grown under different growth conditions.
