  In disordered transition-metal dichalcogenide (TMD) superconductor, both the
strong spin-orbit coupling (SOC) and disorder show remarkable effects on
superconductivity. However, the features of SOC and disorder were rarely
detected directly. Here we report the quantum transport behaviors arising from
the interplay of SOC and disorder in the TMD superconductor 1T-NbSeTe. Before
entering the superconducting state, the single crystal at low temperature shows
a resistivity upturn, which is T1/2 dependent and insensitive to the applied
magnetic fields. The magnetoresistance (MR) at low temperatures shows a H1/2
dependence at high magnetic fields. The characteristics are in good agreement
with the electron-electron interaction (EEI) in a disordered conductor. In
addition, the upturn changes and MR at low magnetic fields suggest the
contribution of weak antilocalization (WAL) effect arising from the strong SOC
in the material. Moreover, the quantitative analyses of the transport features
in different samples imply anomalous disorder-enhanced superconductivity that
needs to be further understood. The results reveal the disorder enhanced EEI
and the strong SOC induced WAL effect in 1T-NbSeTe, which illustrate the
resistivity minimum in the widely studied doped superconductors. The work also
provides insights into the disorder effect on the superconductivity.
