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Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2 O7

Juyal, A and Dwivedi, VK and Verma, S and Nandi, S and Agarwal, A and Mukhopadhyay, S (2022) Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2 O7. In: Physical Review B, 106 (15).

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Official URL: https://doi.org/10.1103/PhysRevB.106.155149


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 Y2Ir2O7 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 ∼108, 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.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to American Physical Society.
Keywords: Binary alloys; Charge density; Charge density waves; Crystallite size; Dielectric relaxation; Iridium alloys; Temperature distribution, Characteristic properties; Charge-density-wave phasis; Charge-density-waves; Highest temperature; Large dielectric constant; Lower frequencies; Lows-temperatures; Negative differential resistances; Nonlinear conductivity; Phase I, Thermal expansion
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Jan 2023 10:34
Last Modified: 03 Jan 2023 10:34
URI: https://eprints.iisc.ac.in/id/eprint/78671

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