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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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 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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