Large enhancement of the CDW resistivity anomaly and traces of superconductivity in imperfect samples of NbTe4
| Autor: | F.S. de Oliveira, B. S. de Lima, N. Chaia, J.C. Canova, A. J. S. Machado, T.W. Grant, F. Abud, L.R. de Faria |
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| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
SUPERCONDUTIVIDADE Materials science Condensed matter physics Hydrostatic pressure Charge density 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Transition metal Electrical resistivity and conductivity Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons General Materials Science Crystallite Anomaly (physics) 0210 nano-technology Phase diagram |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 0254-0584 |
| Popis: | Transition metal chalcogenides usually crystallize in low-dimensional structures that frequently host electronic instabilities such as charge density waves (CDW) and superconductivity. Among them is NbTe4. This compound is a quasi-one-dimensional conductor that exhibits successive CDW transitions and superconductivity at 2.2 K when hydrostatic pressure is applied. The binary Nb-Te phase diagram predicts that this compound is non-stoichiometric and exists within a Te composition range. This work presents a systematic investigation of the physical properties of NbTe4-δ polycrystalline samples. Electrical resistivity measurements show a large enhancement of the anomaly related to the CDW transition in the vicinity of 200 K. Further characterization demonstrates that Te deficiency can also induce superconductivity in this compound at 5.5 K and coexists with the CDW state. |
| Databáze: | OpenAIRE |
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