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Evidence for multiband superconductivity and charge density waves in Ni-doped ZrTe2

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Author(s):
Correa, Lucas ; Ferreira, Pedro S. ; de Faria, Leandro R. ; Dorini, Thiago T. ; Luz, Mario S. da ; Fisk, Zachary ; Torikachvili, Milton S. ; Eleno, Luiz T. F. ; Machado, Antonio J. S.
Total Authors: 9
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 907, p. 9-pg., 2022-03-15.
Abstract

We carried out a comprehensive study of the electronic, magnetic, and thermodynamic properties of Ni -doped ZrTe2. High quality Ni0.04ZrTe1.89 single crystals show a possible coexistence of charge density waves (CDW, T-CDW = 287 K) with superconductivity (T-c = 4.1 K), which we report here for the first time. The temperature dependence of the lower (H-c1) and upper (H-c2) critical magnetic fields both deviate sig-nificantly from the behaviors expected in conventional single-gap s-wave superconductors. However, the behaviors of the normalized superfluid density rho s(T) and H-c2(T) can be described well using a two-gap model for the Fermi surface, in a manner consistent with conventional multiband superconductivity. Electrical resistivity and specific heat measurements show clear anomalies centered near 287 K consistent with a CDW phase transition. Additionally, electronic-structure calculations support the coexistence of electron-phonon multiband superconductivity and CDW order due to the compensated disconnected nature of the electron-and hole-pockets at the Fermi surface. Our electronic structure calculations also suggest that ZrTe2 could reach a non-trivial topological type-II Dirac semimetallic state. These findings highlight that Ni-doped ZrTe2 can be uniquely important for probing the coexistence of superconducting and CDW ground states in an electronic system with non-trivial topology. (c) 2022 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 19/14359-7 - Growth single crystals and investigation of superconducting topological properties in metal transition dichalcogenides
Grantee:Antonio Jefferson da Silva Machado
Support Opportunities: 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 Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/10835-6 - Ab-initio investigation of electronic and phononic properties of superconducting TMDs
Grantee:Pedro Nunes Ferreira
Support Opportunities: Scholarships in Brazil - Master
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 Opportunities: Regular Research Grants
FAPESP's process: 20/08258-0 - Ab initio study of superconducting and topological systems
Grantee:Pedro Nunes Ferreira
Support Opportunities: Scholarships in Brazil - Doctorate