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arXiv · 2407.00498

Quantum oscillation study of the large magnetoresistance in Mo substituted WTe$_2$ single crystals

Sourabh Barua·M. R. Lees·G. Balakrishnan·P. A. Goddard
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Abstract

The list of interesting electrical properties exhibited by transition metal dichalcogenides has grown with the discovery of extremely large magnetoresistance (MR) and type-II Weyl semimetal behaviour in WTe$_2$ and MoTe$_2$. The extremely large MR in WTe$_2$ is still not adequately understood. Here, we systematically study the effect of Mo substitution on the quantum oscillations in the MR in WTe$_2$. The MR decreases with Mo substitution, however, the carrier concentrations extracted from the quantum oscillations show that the charge compensation improves. We believe that earlier interpretations based on the two-band theory, which attribute the decrease in MR to charge imbalance, could be incorrect due to over-parametrization. We attribute the decrease in MR in the presence of charge compensation to a fall in transport mobility, which is evident from the residual resistivity ratio data. The quantum scattering time and the effective masses do not change within experimental errors upon substitution.

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Sourabh Barua, M. R. Lees, G. Balakrishnan, P. A. Goddard. 2024-06-29. Quantum oscillation study of the large magnetoresistance in Mo substituted WTe$_2$ single crystals. https://doi.org/10.1103/physrevb.110.155113

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