1. Observation of multilayer quantum Hall effect in the charge density wave material CaCu$_4$As$_2$
- Author
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Sasmal, Souvik, Saini, Vikas, Ramakrishnan, Sitaram, Dwari, Gourav, Maity, Bishal Baran, Bao, Jin-Ke, Mondal, Rajib, Tripathi, Vikram, van Smaalen, Sander, Singh, Bahadur, and Thamizhavel, A.
- Subjects
Condensed Matter::Superconductivity ,Condensed Matter::Strongly Correlated Electrons ,ddc:530 - Abstract
Physical review research 4(1), L012011 (2022). doi:10.1103/PhysRevResearch.4.L012011, Low-dimensional layered materials manifest an inherent tendency towards the formation of symmetry reduced charge density wave (CDW) states with exotic properties. Here, we elucidate the anisotropic transport properties of CaCu$_4$As$_2$, which crystallizes in a rhombohedral lattice. Temperature-dependent single-crystal x-ray diffraction in conjunction with thermodynamic and transport measurements reveal that CaCu$_4$As$_2$ undergoes a structural or CDW transition below 51 K. For $I���[1\bar{2}10]$, angular-dependent Shubnikov���de Haas oscillations reveal a two-dimensional nature of the charge carriers contributing to the bulk transport in accord with our calculated Fermi surface. In the inverse Hall resistance versus 1/B plot, quantized Hall plateaus are observed. CaCu$_4$As$_2$ thus provides a new platform to understand the coexistence of both the CDW and quantum Hall effect in materials., Published by APS, College Park, MD
- Published
- 2022