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Unconventional superconducting phase in the weakly correlated noncentrosymmetric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Mo</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Al</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mtext>C</mml:mtext></mml:mrow></mml:math>compound
Electrical resistivity, specific-heat, and NMR measurements classify noncentrosymmetric ${\text{Mo}}_{3}{\text{Al}}_{2}\text{C}$ ($\ensuremath{\beta}\text{-Mn}$ type, space group $P{4}_{1}32$) as a strong-coupled superconductor with ${T}_{c}=9\text{ }\text{K}$ deviating notably from BCS-type behavior. The absence of a Hebbel-Slichter peak, a power-law behavior of the spin-lattice relaxation rate (from $^{27}\text{A}\text{l}$ NMR), an electronic specific heat strongly deviating from …