Possible unconventional two-band superconductivity in Mo Te 2

The coexistence of the type-II Weyl semimetal phase and superconductivity in the layered transition-metal dichalcogenide MoTe2 is of great interest as it is considered a promising candidate for an intrinsic topological superconductor. However, the ultralow superconducting critical temperature (T-c) of similar to 0.1 K limits the exploration of the intrinsic superconducting properties. Here the superconductivity in MoTe2 is investigated by systematic ultralow temperature transport measurements with standard four-electrode configuration, together with the hard point-contact (PC) technique which can enhance the T-c and detect the in situ spectroscopic information of the pairing symmetry. The temperature dependence of the superconducting critical field from transport measurements and the two-step double conductance peaks from the PC spectra measurements both suggest the two-band superconductivity in MoTe2. Together with the occasional observation of zero-bias conductance peaks in the spectra, our results suggest the unconventional two-band superconductivity with potential s(+-) pairing in MoTe2.