Unconventional superconductivity in weakly correlated, non-centrosymmetric $\rm{Mo_3Al_2C}$

Details Unconventional superconductivity in weakly correlated, non-centrosymmetric $\rm{Mo_3Al_2C}$ Unconventional superconductivity in weakly correlated, non-centrosymmetric $\rm{Mo_3Al_2C}$

2010-07-02

arxiv.org/abs/1007.0420v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

Electrical resistivity, specific heat and NMR measurements classify non-centrosymmetric $\rm Mo_3Al_2C$ ($\beta$-Mn type, space group $P4_132$) as a strong-coupled superconductor with $T_c = 9$~K deviating notably from BCS-like behaviour. The absence of a Hebbel-Slichter peak, a power law behaviour of the spin-lattice relaxation rate (from $^{27}$Al NMR), a $T^3$ temperature dependence of the specific heat and a pressure enhanced $T_c$ suggest unconventional superconductivity with a nodal structure of the superconducting gap. Relativistic DFT calculations reveal a splitting of degenerate electronic bands due to the asymmetric spin-orbit coupling, favouring a mix of spin-singlet and spin triplet components in the superconducting condensate, in absence of strong correlations among electrons.

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