Possible multiband superconductivity in the quaternary carbide YRe2SiC. (14th May 2021)

• Record Type: Journal Article
• Authors: R De Faria, L; Ferreira, P P; Correa, L E; Eleno, L T F; Torikachvili, M S; Machado, A J S
• Is Part Of: Superconductor science & technology. Volume 34:Number 6(2021)
• Publication Date: 2021-05-14
• Subjects: carbides -- multiband superconductivity -- quaternary compounds -- YRe2SiC; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/abf7cf
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We report for the first time the occurrence of superconductivity in the quaternary silicide carbide YRe2 SiC with T c ≍ 5.9 K. The emergence of superconductivity was confirmed by means of magnetic susceptibility, electrical resistivity, and heat capacity measurements. The presence of a well-developed heat capacity feature at T c confirms that superconductivity is a bulk phenomenon, while a second feature in the heat capacity near 0.5 T c combined with the unusual temperature dependence of the upper critical field H c2 ( T ) indicate the presence of a multiband superconducting state. Additionally, the linear dependence of the lower critical field H c1 with temperature resemble the behavior found in compounds with unconventional pairing symmetry. Band structure calculations reveal that YRe2 SiC could harbor a non-trivial topological state and that the low-energy states occupy multiple disconnected sheets at the Fermi surface, with different degrees of hybridization, nesting, and screening effects, therefore making unconventional multiband superconductivity plausible.