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Investigation of the superconductivity and magnetism in compounds that crystallize on the YbMo2Al4 and IrIn3 prototype

Grant number: 16/11565-7
Support type:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): November 01, 2016
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Antonio Jefferson da Silva Machado
Grantee:Frederico Benedetto Santos
Home Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil
Associated scholarship(s):18/20546-1 - Single crystal growth of (HF, SC, RE)V2Ga4 (re = rare earth) and (Fe, co, Ru)1-xRMxGa3 (RM = refractory metals) compounds and the study of their Fermi surface, electronic structure, and superconducting properties under extreme conditions, BE.EP.DD


This work proposal is about the research of promising new materials for superconductivity that crystallize in YbMo2Al4 prototype. Preliminary results presented in this proposal, show unambiguously that two members of this family with HfV2Ga4 and ScV2Ga4 compositions are new superconductors with critical temperatures of 4.0 K and 3.0 K respectively. These materials exhibit strong signature multiband behavior revealed by the phase diagram Hc2 vs T. These results suggest that there is a huge family of materials that have unusual characteristics of superconductivity in the sense point not yet explored in the literature. Furthermore, these results suggest that there may be new compounds having coexistence of magnetism and superconductivity. Other material of much interest in this work plan is the FeGa3 compound crystallizes in IrIn3 prototype. This is a semiconductor compound of great interest in the literature. In this regard, preliminary results which will be shown in this proposal confirming that a small replacement of iron by molybdenum generates a superconductor with critical temperature of 9.5 K. In this context, this proposal presented is totally unique and offers a great opportunity to explore new materials with unusual properties. At the same time, this proposal also offers a interesting opportunity for PhD of the candidate. (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)
CORREA, L. E.; NOVA, J. C. C.; DE FARIA, L. R.; SANTOS, F. B.; DE LIMA, B. S.; NUNES, C. A.; COELHO, G. C.; ROGL, P.; FISK, Z.; MACHADO, A. J. S. Evidence of multiband behavior in a new superconductor Ta0.8Zr0.2B with FeB-prototype structure. Journal of Alloys and Compounds, v. 803, p. 597-600, SEP 30 2019. Web of Science Citations: 0.
FERREIRA, P. P.; SANTOS, F. B.; MACHADO, A. J. S.; PETRILLI, H. M.; ELENO, L. T. F. Insights into the unconventional superconductivity in HfV2Ga4 and ScV2Ga4 from first-principles electronic-structure calculations. Physical Review B, v. 98, n. 4 JUL 18 2018. Web of Science Citations: 4.
SANTOS, F. B.; CORREA, L. E.; DE LIMA, B. S.; CIGARROA, O. V.; DA LUZ, M. S.; GRANT, T.; FISK, Z.; MACHADO, A. J. S. Unusual superconducting behavior in HfV2Ga4. Physics Letters A, v. 382, n. 15, p. 1065-1068, APR 19 2018. Web of Science Citations: 2.

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