Study of the reentrance and electronic tunneling in superconductors of the Re3M families (M = W, Mo, Nb, Ta) and MX3 (M = Zr, Nb; X = Te, Se)

• Grant number: 22/02691-0
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: August 01, 2022
• End date: July 31, 2024
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Antonio Jefferson da Silva Machado
• Grantee: Fábio Santos Alves Abud
• Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil

Abstract

It is proposed in this project the experimental study of the superconducting reentrance of noncentrosymmetric materials (NCS) Re3M (M = W, Mo, Nb, Ta) and tricalcogenides MX3 (M = Zr, Nb; X= Te, Se) as well as the implementation of the electron tunneling spectroscopy experimental technique. The systematic study of the superconducting reentrance will be conducted through magnetic field dependent resistive measurements in order to evaluate its correlation with anisotropy, superconducting gap symmetry, disorder, and fluctuation effects. In this context, high quality single crystals will be grown via Chemical Vapor Transport and Czochralski techniques. Superconducting electron tunneling measurements are expected to be conducted in planar superconducting tunnel junctions. These devices will be fabricated on the single crystal surfaces using thin films deposition techniques, such as electron beam and Atomic Layer Deposition (ALD), in a synergic colaboration with the Laboratório Nacional de Nanotecnologia (LNNANO) of the CNPEM. In addition to study the reentrance phenomenum itself, the expected results of this project are also valuable in providing further information on the superconducting pairing symmetry arising in NCS superconductors, and in the topological superconductivity that may emerge in quasi- bidimensional materials such as the tricalcogenides. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ABUD, F.; CHAIA, N.; TORIKACHVILI, M. S.; JARDIM, R. F.. Conventional s-wave superconductivity in the non-centrosymmetric compounds Re3W, Re3W0.5Nb0.5, and Re3W0.5Ta0.5. Journal of Alloys and Compounds, v. 959, p. 8-pg., 2023-05-19. (22/02691-0, 13/07296-2)