Possible multiband superconductivity in the quaternary carbide YRe2SiC

Author(s)

De Faria, L. R. ^[1] ; Ferreira, P. P. ^[1] ; Correa, L. E. ^[1] ; Eleno, L. T. F. ^[1] ; Torikachvili, M. S. ^[2] ; Machado, A. J. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Escola Engn Lorena, POB 116, Lorena, SP - Brazil

^[2] San Diego State Univ, Dept Phys, San Diego, CA 92182 - USA

• Document type: Journal article
• Source: SUPERCONDUCTOR SCIENCE & TECHNOLOGY; v. 34, n. 6 JUN 2021.
• Web of Science Citations: 0

Abstract

We report for the first time the occurrence of superconductivity in the quaternary silicide carbide YRe2SiC with T-c approximate to 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 0.5T(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 YRe2SiC 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. (AU)

• FAPESP's process: 16/11774-5 - Study of superconductivity and magnetism in compounds which crystallize on the YbMo2Al4 and IrIn3 prototype structure
• Grantee: Antonio Jefferson da Silva Machado
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/05005-7 - Computational Materials Laboratory for the ab initio study of the stability of intermetallic compounds
• Grantee: Luiz Tadeu Fernandes Eleno
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/14359-7 - Growth single crystals and investigation of superconducting topological properties in metal transition dichalcogenides
• Grantee: Antonio Jefferson da Silva Machado
• Support Opportunities: Regular Research Grants
• FAPESP's process: 19/17878-5 - Topological superconductivity in intermetallics (Ni,Zr)Te2 type
• Grantee: Antonio Jefferson da Silva Machado
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• FAPESP's process: 20/08258-0 - Ab initio study of superconducting and topological systems
• Grantee: Pedro Nunes Ferreira
• Support Opportunities: Scholarships in Brazil - Doctorate