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Investigation of new superconductors of the Zr-Cu-Te and Zr-Ni-Te systems

Grant number: 13/16873-3
Support Opportunities:Regular Research Grants
Duration: May 01, 2014 - April 30, 2016
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Antonio Jefferson da Silva Machado
Grantee:Antonio Jefferson da Silva Machado
Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil


This plan discusses preliminary results which show that the new superconductors of the Te-Cu-Zr and Zr-Ni-Te systems (not yet published) that are promising from the viewpoint of new materials. In these compounds, copper and nickel are elements intercalating host or matrix compound in stoichiometric ZrTe2 which are able to induce superconductivity with relatively high critical temperature. Based on the preliminary results presented below this work plan aims to explore new intercalating elements such as Co, Fe, Pd and Pt to understand the role of these intercalating the superconducting properties. At the same time, this plan presents an idea quite doable crystal growth of compounds presented here preliminarily, that will assess more precisely the properties of these new materials and may help to understand the relationship between superconductivity and some instabilities such as CDW transition (Charge Density Wave) and SDW (Spin Density Wave). The effect of pressure on this electronic system is of fundamental importance to understand how the coexistence of CDW and SDW and superconductivity or behave with an external pressure. Understanding this will allow "designing" new materials with suitable chemical doping. In other words, two control parameters, chemical doping and external pressure will build the phase diagram of these new low dimensional systems. (AU)

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Scientific publications (6)
(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)
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, . (16/11774-5, 13/16873-3, 16/11565-7)
MACHADO, A. J. S.; SANTOS, F. B.; DE LIMA, B. S.; RENOSTO, S. T.; CORREA, L. E.; CIGARROA, O. V.; DA LUZ, M. S.; FISK, Z.. Superconductivity in the ternary ZrVGe compound. Physics Letters A, v. 379, n. 14-15, p. 1057-1061, . (13/16873-3, 09/54001-2, 10/11770-3, 13/15238-2)
DE LIMA, B. S.; CHAIA, N.; CORREA, L. E.; OLIVEIRA, F. S.; DE FARIA, L. R.; DE OLIVEIRA, I; COELHO, G. C.; MACHADO, A. J. S.. Experimental Study of the Binary Nb-Te System. JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, v. 40, n. 5, p. 697-705, . (13/16873-3)
MACHADO, A. J. S.; BAPTISTA, N. P.; DE LIMA, B. S.; CHAIA, N.; GRANT, T. W.; CORREA, L. E.; RENOSTO, S. T.; SCARAMUSSA, A. C.; JARDIM, R. F.; TORIKACHVILI, M. S.; et al. Evidence for topological behavior in superconducting CuxZrTe2-y. Physical Review B, v. 95, n. 14, . (13/16873-3)
DE LIMA, B. S.; CHAIA, N.; GRANT, T. W.; DE FARIA, L. R.; CANOVA, J. C.; DE OLIVEIRA, F. S.; ABUD, F.; MACHADO, A. J. S.. Large enhancement of the CDW resistivity anomaly and traces of superconductivity in imperfect samples of NbTe4. Materials Chemistry and Physics, v. 226, p. 95-99, . (16/11774-5, 13/16873-3)
DE LIMA, B. S.; DE CASSIA, R. R.; SANTOS, F. B.; CORREA, L. E.; GRANT, T. W.; MANESCO, A. L. R.; MARTINS, G. W.; ELENO, L. T. F.; TORIKACHVILI, M. S.; MACHADO, A. J. S.. Properties and superconductivity in Ti-doped NiTe2 single crystals. Solid State Communications, v. 283, p. 27-31, . (13/16873-3, 16/10167-8)

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