Year: 2022
Type: article
Abstract: The subtle interplay of band topology and symmetry broken phase, induced by electron correlations, has immense contemporary relevance and potentially offers novel physical insights. Here, we provide evidence of possible charge density wave (CDW) in bulk ${\mathrm{Y}}_{2}{\mathrm{Ir}}_{2}{\mathrm{O}}_{7}$ for $T<10$ K, and the Weyl semimetal (WSM) phase at higher temperatures. We observe the following characteristic properties of the CDW phase: (i) current induced nonlinear conductivity with negative differential resistance at low temperature, (ii) low-frequency Debye-like dielectric relaxation at low temperature with a large dielectric constant $\ensuremath{\sim}{10}^{8}$, and (iii) an anomaly in the temperature dependence of the thermal expansion coefficient. The WSM phase at higher temperature is analyzed using the dc and ac transport measurements, which show an inductive response at low frequencies. More interestingly, we show that by reducing the crystallite size, the low-temperature CDW phase can be eliminated leading to the restoration of the WSM phase.
Authors: Abhishek Juyal, Vinod Kumar Dwivedi, Sonu Verma, Shibabrata Nandi, Amit Agarwal, Soumik Mukhopadhyay
Institutions: Georgia Tech-Europe, Centre National de la Recherche Scientifique, Georgia Institute of Technology, Georgia Tech-CNRS Laboratory, Indian Institute of Technology Kanpur, Indian Institute of Science Bangalore, Institute for Basic Science, Forschungszentrum Jülich, Jülich Aachen Research Alliance, RWTH Aachen University
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1298976826, G496710461
OpenAlex ID: W4307563166