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Conductivity noise across temperature-driven transitions of rare-earth nickelate heterostructures

Daptary, Gopi Nath and Kumar, Siddharth and Kareev, M and Chakhalian, J and Bid, Aveek and Middey, S (2019) Conductivity noise across temperature-driven transitions of rare-earth nickelate heterostructures. In: PHYSICAL REVIEW B, 100 (12).

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Official URL: https://dx.doi.org/10.1103/PhysRevB.100.125105


The metal-insulator transition (MIT) of bulk rare-earth nickelates is accompanied by a simultaneous charge ordering (CO) transition. We have investigated low-frequency resistance fluctuations (noise) across the MIT and magnetic transition of EuNiO3/LaNiO3] superlattices, where selective suppression of charge ordering has been achieved by mismatching the superlattice periodicity with the periodicity of charge ordering. We have observed that irrespective of the presence or absence of long-range CO, the noise magnitude is enhanced by several orders with a strong non-1/f (f = frequency) component when the system undergoes a MIT and magnetic transition. The higher-order statistics of resistance fluctuations reveal the presence of strong non-Gaussian components in both cases, further indicating inhomogeneous electrical transport arising from the electronic phase separation. Specifically, we find almost three orders of magnitude smaller noise in the insulating phase of the sample without long-range CO compared to the sample with CO. These findings suggest that digital synthesis can be a potential route to implement electronic transitions of complex oxides for device application.

Item Type: Journal Article
Additional Information: copyright for this article belongs to AMER PHYSICAL SOC
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 05 Nov 2019 07:33
Last Modified: 05 Nov 2019 07:33
URI: http://eprints.iisc.ac.in/id/eprint/63633

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