Substitution effect on the superconductivity in Mo_3-xRe_xAl₂C with β-Mn structure prepared by microwave method

We report the microwave synthesis and the doping effect of Mo_3-xRe_xAl₂C (0 ≤ x ≤ 0.3) superconductor. Re doping into Mo₃Al₂C results in a regular shrinkage of the lattice, marked by the linear decrease of lattice parameter a from 6.868(1) Å (for Mo₃Al₂C) to 6.846(2) Å (for Mo_2.7Re_0.3Al₂C). Upon Re doping, T_c of Mo_3-xRe_xAl₂C first increases and then decreases, with the maximum T_c = 9.14 K at the optimal doping level of x = 0.09. Our report provides a convenient method to synthesize Mo_3-xRe_xAl₂C within minutes, and also marks the first Re doping study with enhanced superconductivity on the non-centrosymmetric superconductor Mo₃Al₂C.