| Texto completo | |
| Autor(es): |
Fabris, Fernando
;
Garcia-Flores, Ali F.
;
Cagigas, Julian Andres Munevar
;
Acuna, Jose Javier Saez
;
Rettori, Carlos
;
Urbano, Ricardo R.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Chemistry Chemical Physics; v. 26, n. 34, p. 9-pg., 2024-08-05. |
| Resumo | |
Niobium carbide (NbC) is a high-field type II superconductor with a critical temperature (TC) of 11.1 K, slightly exceeding that of pure Nb (TC = 9 K). The reduction of NbC to the nanoparticle scale leads to significant changes in its critical field and/or the superconducting temperature. This study presents findings on superconducting NbC nanoparticles with TC similar or equal to 10 K produced through laser ablation in acetone, where different conditions of laser fluence and centrifugation were studied. Analysis by X-ray diffraction confirmed the cubic NbC phase, while electron microscopy images displayed approximately 8 nm spherical particles, showing no noticeable size variation with laser fluence. Additionally, magnetization curves exhibited both magnetic and superconducting loops for all investigated samples. A decrease in laser fluence resulted in the suppression of diamagnetic behavior below TC. Furthermore, all samples exhibited a weak electron spin resonance (ESR) Curie-like signal at g similar or equal to 2.0, probably linked to localized defects on the particle's surface. The simultaneous existence of superconductivity and magnetism in nanoparticles has recently garnered significant research attention. This intricate scenario and unique properties arise from the significant enhancement of the surface-to-volume ratio in these superconducting NbC nanoparticles, emphasizing the need for further investigation to unveil novel material properties and shed new light on our comprehension of the superconducting phenomenon in this particular morphology. Superconducting niobium carbide (NbC) nanoparticles produced by laser ablation in acetone at different laser fluences. The magnetic and superconducting properties of the nanoparticles were subsequently studied. (AU) | |
| Processo FAPESP: | 19/13678-1 - Propriedades magnéticas em estruturas nanoconfinadas: nanopartículas metálicas e isolantes dopadas com terras-raras produzidas por Laser Ablation e síntese química. |
| Beneficiário: | Fernando Fabris |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |