Bauer, E., Rogl, G., Chen, X.-Q., Khan, R. T., Michor, H., Hilscher, G., Royanian, E., Kumagai, K., Li, D. Z., Li, Y. Y., Podloucky, R., & Rogl, P. (2010). Unconventional superconducting phase in the weakly correlated noncentrosymmetric Mo₃Al₂C compound. Physical Review B, 82(6), Article 064511. https://doi.org/10.1103/physrevb.82.064511
E138-04 - Forschungsbereich Quantum Materials E138-03 - Forschungsbereich Functional and Magnetic Materials
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Zeitschrift:
Physical Review B
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ISSN:
2469-9950
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Datum (veröffentlicht):
1-Aug-2010
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Umfang:
5
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Verlag:
APS
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Peer Reviewed:
Ja
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Keywords:
Condensed Matter Physics; Electronic, Optical and Magnetic Materials
en
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 27Al 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.
