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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Two-band superconductivity with unconventional pairing symmetry in HfV2Ga4

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Author(s):
Bhattacharyya, A. [1] ; Ferreira, R. P. [2] ; Santos, F. B. [3] ; Adroja, D. T. [4, 5] ; Lord, J. S. [4] ; Correa, L. E. [3] ; Machado, A. J. S. [3] ; Manesco, A. L. R. [2, 6] ; Eleno, L. T. F. [2]
Total Authors: 9
Affiliation:
[1] Ramakrishna Mission Vivekananda Educ & Res Inst, Dept Phys, Howrah 711202, W Bengal - India
[2] Univ Scio Paulo EEL USP, Mat Engn Dept Demar, Computat Mat Sci Grp ComputEEL, Escola Engn Lorena, Lorena, SP - Brazil
[3] Univ Scio Paulo EEL USP, Mat Engn Dept Demar, Escola Engn Lorena, Lorena, SP - Brazil
[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon - England
[5] Univ Johannesburg, Phys Dept, Highly Correlated Matter Res Grp, ZA-2006 Auckland Pk - South Africa
[6] Delft Univ Technol, Kavli Inst Nanosci, Delft - Netherlands
Total Affiliations: 6
Document type: Journal article
Source: PHYSICAL REVIEW RESEARCH; v. 2, n. 2 APR 1 2020.
Web of Science Citations: 0
Abstract

In this Rapid Communication, we have examined the superconducting ground state of the HfV2Ga4 compound using resistivity, magnetization, zero-field (ZF), and transverse-field (TF) muon-spin relaxation and rotation (mu SR) measurements. Resistivity and magnetization unveil the onset of bulk superconductivity with T-C similar to 3.9 K. TF-mu 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 HfV2Ga4 family stands out as an open avenue to novel unexplored unconventional superconducting compounds and an ideal playground to investigate the mechanisms behind such phenomena. (AU)

FAPESP's process: 16/11565-7 - Investigation of the superconductivity and magnetism in compounds that crystallize on the YbMo2Al4 and IrIn3 prototype
Grantee:Frederico Benedetto Santos
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 19/05005-7 - Computational Materials Laboratory for the ab initio study of the stability of intermetallic compounds
Grantee:Luiz Tadeu Fernandes Eleno
Support type: Regular Research Grants
FAPESP's process: 16/11774-5 - Study of superconductivity and magnetism in compounds which crystallize on the YbMo2Al4 and IrIn3 prototype structure
Grantee:Antonio Jefferson da Silva Machado
Support type: Regular Research Grants
FAPESP's process: 18/08819-2 - Growth of single crystals of CdI2 prototype dicalcogens and investigation of superconducting properties
Grantee:Lucas Eduardo Corrêa
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 18/10835-6 - Ab-initio investigation of electronic and phononic properties of superconducting TMDs
Grantee:Pedro Pires Ferreira
Support type: Scholarships in Brazil - Master
FAPESP's process: 19/07082-9 - Physics of graphene/superconductor junctions
Grantee:Antonio Lucas Rigotti Manesco
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 18/20546-1 - Single crystal growth of (Hf, Sc, RE)V2Ga4 (RE = rare earth) and (Fe, Co, Ru)1-xRMxGa3 (RM = refractory metals) compounds and the study of their Fermi surface, electronic structure, and superconducting properties under extreme conditions
Grantee:Frederico Benedetto Santos
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 16/10167-8 - Investigation of electronic and topological properties of superconductor-graphene heterojunctions for applications in quantum computation devices
Grantee:Antonio Lucas Rigotti Manesco
Support type: Scholarships in Brazil - Doctorate (Direct)