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We report for the first time the occurrence of superconductivity in thequaternary silicide carbide YRe2SiC with Tc = 5.9 K. The emergence ofsuperconductivity was confirmed by means of magnetic susceptibility, electricalresistivity, and heat capacity measurements. The presence of a well developedheat capacity feature at Tc confirms that superconductivity is a bulkphenomenon, while a second feature in the heat capacity near 0.5 Tc combinedwith the unusual temperature dependence of the upper critical field Hc2(T)indicate the presence of a multiband superconducting state. Additionally, thelinear dependence of the lower critical field Hc1 with temperature resemble thebehavior found in compounds with unconventional pairing symmetry. Bandstructure calculations reveal YRe2SiC could harbor a non-trivial topologicalstate and that the low-energy states occupy multiple disconnected sheets at theFermi surface, with different degrees of hybridization, nesting, and screeningeffects, therefore making unconventional multiband superconductivity plausible.

Possible multiband superconductivity in the quaternary carbide YRe2SiC