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Two-band superconductivity with unconventional pairing symmetry in HfV2Ga4

Amitava Bhattacharyya Pedro Ferreira; F. B Santos; Devashibhai Adroja; James Lord; L. E Correa; Antonio Jefferson da Silva Machado; Antonio L.R Manesco; Luiz Tadeu Fernandes Eleno

Physical Review Research v2., p.022001-, 2020

2020

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  • Título:
    Two-band superconductivity with unconventional pairing symmetry in HfV2Ga4
  • Autor: Amitava Bhattacharyya
  • Pedro Ferreira; F. B Santos; Devashibhai Adroja; James Lord; L. E Correa; Antonio Jefferson da Silva Machado; Antonio L.R Manesco; Luiz Tadeu Fernandes Eleno
  • Assuntos: SUPERCONDUTIVIDADE; FÍSICA; MATÉRIA CONDENSADA; FÍSICA DA MATÉRIA CONDENSADA
  • É parte de: Physical Review Research v2., p.022001-, 2020
  • Notas: Disponível em: https://doi.org/10.1103/PhysRevResearch.2.022001. Acesso em: 15 mar. 2022.
  • Descrição: In this Rapid Communication, we have examined the superconducting ground state of the HfV 2 Ga 4 compound using resistivity, magnetization, zero-field (ZF), and transverse-field (TF) muon-spin relaxation and rotation ( μ SR ) measurements. Resistivity and magnetization unveil the onset of bulk superconductivity with T C ∼ 3.9 K. TF- μ SR measurements show the temperature dependence of the superfluid density, indicating, surprisingly, a nodal two-gap ( s + d ) -wave superconducting order parameter. In addition, the ZF muon relaxation rate increases with decreasing temperature below 4.6 K, suggesting the presence of weak spin fluctuations. These observations pointed to an unconventional multiband nature of the superconducting ground state. To better understand these findings, we carry out first-principles electronic-structure calculations, further highlighting multiple disconnected sheets with very different orbital weights and spin-orbit coupling composing the Fermi surface, bridging the way for a nodal multiband superconductivity scenario. In this vein, therefore, the HfV 2 Ga 4 family stands out as an open avenue to novel unexplored unconventional superconducting compounds and an ideal playground to investigate the mechanisms behind such phenomena.
  • Data de criação/publicação: 2020
  • Formato: v. 6, p. 22001-1-22001-6.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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