Unconventional superconducting phase in the weakly correlated noncentrosymmetric Mo3Al2C compound

E. Bauer; G. Rogl; Xing-Qiu Chen; R. T. Khan; H. Michor; G. Hilscher; E. Royanian; K. Kumagai; D. Z. Li; Y. Y. Li; R. Podloucky; P. Rogl

doi:10.1103/PhysRevB.82.064511

Unconventional superconducting phase in the weakly correlated noncentrosymmetric Mo3Al2C compound

E. Bauer, G. Rogl, Xing-Qiu Chen, R. T. Khan, H. Michor, G. Hilscher, E. Royanian, K. Kumagai, D. Z. Li, Y. Y. Li, R. Podloucky, P. Rogl

DOI 10.1103/PhysRevB.82.064511 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Electrical resistivity, specific-heat, and NMR measurements classify noncentrosymmetric Mo3Al2C (β-Mn type, space group P4132) as a strong-coupled superconductor with Tc=9 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 A27l NMR), an electronic specific heat strongly deviating from BCS model and a pressure enhanced Tc suggest unconventional superconductivity with possibly a nodal structure of the superconducting gap. Relativistic density-functional theory calculations reveal a splitting of degenerate electronic bands due to the asymmetric spin-orbit coupling, favoring a mix of spin-singlet and spin-triplet components in the superconducting condensate, in absence of strong correlations among electrons.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9	Pressure not reported	onset
Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9	Pressure not reported	onset
Mo3Al2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9	Pressure not reported	onset
αMoC Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.95	Pressure not reported	unknown
ηMoC Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.57	Pressure not reported	unknown
Mo2BC Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.33	Pressure not reported	unknown