This work presents the emergence of superconductivity in Re substituted topological Weyl semimetal MoTe2. Re substitution for Mo sites lead to a sizable enhancement in the superconducting transition temperature (Tc). A record high Tc at ambient pressure in a 1T -MoTe2 (room temperature structure) related sample is observed for the Mo0.7Re0.3Te2 composition (Tc = 4.1 K, in comparison MoTe2, shows a Tc of 0.1 K). The experimental and theoretical studies indicate that Re substitution is doping electrons and facilitates the emergence of superconductivity by enhancing the electronphonon coupling and density of states at the Fermi level. Our findings, therefore, open a new way to further manipulate and enhance the superconducting state together with the topological states in 2D van der Waals materials.

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Recently, high-entropy alloys (HEAs) have emerged as a unique platform for discovering superconducting materials and offer avenues to explore exotic superconductivity. The highly disordered nature of HEAs suggests the regular phonon required for BCS superconductivity may be unlikely to occur. Therefore, understanding the microscopic properties of these superconducting HEAs is important. We report a detailed characterization of the superconducting properties of the noncentrosymmetric (α-Mn structure) HEAs (HfNb) 0.10 (MoReRu) 0.90 and (ZrNb) 0.10 (MoReRu) 0.90 by using magnetization, specific heat, AC transport, and muon-spin relaxation/rotation (μSR). Despite the disordered nature, low-temperature specific heat and transverse-field muon spin rotation measurements suggest a nodeless isotropic superconducting gap, and zero-field μSR measurements confirm that time reversal symmetry is preserved in the superconducting ground state.

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