Properties and superconductivity in Ti-doped NiTe2 single crystals

Author(s)

de Lima, B. S. ^[1] ; de Cassia, R. R. ^[1] ; Santos, F. B. ^[1] ; Correa, L. E. ^[1] ; Grant, T. W. ^[1] ; Manesco, A. L. R. ^[1] ; Martins, G. W. ^[1] ; Eleno, L. T. F. ^[1] ; Torikachvili, M. S. ^[2] ; Machado, A. J. S. ^[1]

Affiliation

^[1] Univ Sao Paulo, Escola Engn Lorena, BR-12600970 Lorena, SP - Brazil

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

• Document type: Journal article
• Source: Solid State Communications; v. 283, p. 27-31, NOV 2018.
• Web of Science Citations: 0

Abstract

Transition metal dichalcogenides (TMDs) usually show simple structures, however, with interesting properties. Recently some TMDs have been pointed out as type-II Dirac semimetals. In the present work, we investigate the physical properties of a new candidate for type-II Dirac semimetal and investigate the effect of titanium doping on physical properties of Ti-doped single crystalline samples of NiTe2. It was found that this compound shows superconducting properties with a critical temperature close to 4.0 K. Interestingly, applied pressures up to 1.3 GPa have no effect upon the superconducting state. Density Functional Theory (DFT) calculations demonstrate the presence of a Dirac cone in the band structure of NiTe2 literature when Spin-Orbit Coupling (SOC) is included, which is in agreement with a recent report for this compound. Also, our calculations demonstrate that Ti suppresses the formation of these non-trivial states. (AU)

• FAPESP's process: 13/16873-3 - Investigation of new superconductors of the Zr-Cu-Te and Zr-Ni-Te systems
• Grantee: Antonio Jefferson da Silva Machado
• Support type: Regular Research Grants
• FAPESP's process: 16/10167-8 - Investigation of electronic and topological properties of superconductor-graphene heterojunctions for applications in quantum computation devices
• Grantee: Antonio Lucas Rigotti Manesco
• Support type: Scholarships in Brazil - Doctorate (Direct)