Absence of superconductivity in NbB. (2017)
- Authors:
- USP affiliated authors: MACHADO, ANTONIO JEFFERSON DA SILVA - EEL ; JARDIM, RENATO DE FIGUEIREDO - EEL ; ABUD, FÁBIO SANTOS ALVES - IF ; CORRÊA, LUCAS EDUARDO - EEL
- Unidades: EEL; IF
- Sigla do Departamento: LOM
- DOI: 10.1103/physrevmaterials.1.044803
- Assunto: SUPERCONDUTIVIDADE
- Agências de fomento:
- Language: Inglês
- Abstract: A systematic study of the superconducting properties in a series of arc-melted Nb-B samples close to the 1:1 composition was carried out. Powder x-ray diffraction (XRD) shows that all samples are both nonstoichiometric and composed of two crystal phases: a majority orthorhombic NbB-type phase and traces of a minor body-centered-cubic Nb-rich phase Nb𝑠𝑠 with stoichiometry close to Nb0.98B0.02. The emergence of superconductivity near 𝑇𝑐∼9.0K was inferred from magnetization data in chunk and powder samples. However, the very small superconducting volume fractions are inconsistent with superconductivity arising from the major NbB phase. On the other hand, micrographs of selected samples clearly show that the minority Nb𝑠𝑠 forms a three-dimensional network of filaments that meander around the grains of the majority phase, forming a percolation path. Here we report the superconductivity of the Nb𝑠𝑠 phase and argue that the low superconducting volume fraction of nonstoichiometric NbB and zero resistance are due to the filaments of the minority phase. The electronic contribution to the entropy of the superconducting state, yielded from an analysis using the 𝛼 model for single-band systems, indicates that the Sommerfeld constant of the arc-melted samples is close to the values found in nonsuperconducting NbB. Micrograph, XRD, and bulk measurements of magnetization, electrical resistivity, and specific heat suggest that the superconducting state in the NbB samples bearing some Nb𝑠𝑠 minority phase is due to the latter.
- Imprenta:
- Source:
- Título: Physical Review Materials
- ISSN: 2475-9953
- Volume/Número/Paginação/Ano: v.1, art. n. 44803, p. 1-6, 2017
- Status:
- Artigo possui versão em acesso aberto em repositório (Green Open Access)
- Versão do Documento:
- Versão submetida (Pré-print)
- Acessar versão aberta:
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ABNT
ABUD, F et al. Absence of superconductivity in NbB. Physical Review Materials, v. 1, n. art. 44803, p. 1-6, 2017Tradução . . Disponível em: https://doi.org/10.1103/physrevmaterials.1.044803. Acesso em: 02 abr. 2026. -
APA
Abud, F., Correa, L. E., Souza Filho, I. R. de, Machado, A. J. da S., Torikachvili, M. S., & Jardim, R. de F. (2017). Absence of superconductivity in NbB. Physical Review Materials, 1( art. 44803), 1-6. doi:10.1103/physrevmaterials.1.044803 -
NLM
Abud F, Correa LE, Souza Filho IR de, Machado AJ da S, Torikachvili MS, Jardim R de F. Absence of superconductivity in NbB. [Internet]. Physical Review Materials. 2017 ;1( art. 44803): 1-6.[citado 2026 abr. 02 ] Available from: https://doi.org/10.1103/physrevmaterials.1.044803 -
Vancouver
Abud F, Correa LE, Souza Filho IR de, Machado AJ da S, Torikachvili MS, Jardim R de F. Absence of superconductivity in NbB. [Internet]. Physical Review Materials. 2017 ;1( art. 44803): 1-6.[citado 2026 abr. 02 ] Available from: https://doi.org/10.1103/physrevmaterials.1.044803 - Absence of superconductivity in 'NB''B'
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