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Evidence for multiband superconductivity and charge density waves in Ni-doped ZrTe$_2$ by Correa, Lucas E.; Ferreira, Pedro P.; de Faria, Leandro R.; Dorini, Thiago T.; da Luz, Mário S.; Fisk, Zachary; Torikachvili, Milton S.; Eleno, Luiz T. F.; Machado, Antonio J. S. is a scholarly article available to read on EtoBox.

What is Evidence for multiband superconductivity and charge density waves in Ni-doped ZrTe$_2$ about?

We carried out a comprehensive study of the electronic, magnetic, and thermodynamic properties of Ni-doped ZrTe$_2$. High quality Ni$_{0.04}$ZrTe$_{1.89}$ single crystals show a possible coexistence of charge density waves (CDW, T$_{CDW}\approx287$\,K) with superconductivity (T$_c\approx 4.1$\,K), which we report here for the first time. The temperature dependence of the lower (H$_{c_1}$) and upper (H$_{c_2}$) critical magnetic fields both deviate significantly from the behaviors expected in conventional single-gap s-wave superconductors. However, the behaviors of the normalized superfluid density $\rho_s(T)$ and H$_{c_2}(T)$ 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 ZrTe$

Author

Correa, Lucas E.; Ferreira, Pedro P.; de Faria, Leandro R.; Dorini, Thiago T.; da Luz, Mário S.; Fisk, Zachary; Torikachvili, Milton S.; Eleno, Luiz T. F.; Machado, Antonio J. S.

Published

2021

Language

EN