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Tuning the semimetallic charge transport in the Weyl semimetal candidate Eu2Ir2O7(111) epitaxial thin film with an all-in-all-out spin structure

Ghosh, M and Bhat, SG and Pal, A and Kumar, PSA (2022) Tuning the semimetallic charge transport in the Weyl semimetal candidate Eu2Ir2O7(111) epitaxial thin film with an all-in-all-out spin structure. In: Journal of Physics Condensed Matter, 34 (16).

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Official URL: https://doi.org/10.1088/1361-648X/ac50da


We report the stoichiometric epitaxial growth of the Eu2Ir2O7 (111) thin film on YSZ substrate by a two-step solid phase epitaxy (SPE) method. An optimized post-annealing environment of the SPE was superior over the conventional air annealing procedure to get rid of the typical impurity phase, Eu2O3. The thickness-dependent structural study on Eu2Ir2O7 (111) thin films suggests a systematic control of Ir/Eu stoichiometry in our films, which is otherwise difficult to achieve. In addition, the low-temperature electrical resistivity studies strongly support the claim. The power-law dependence analysis of the resistivity data exhibits a power exponent of 0.52 in 50 nm sample suggesting possible disorder-driven semimetallic charge transport in the 3D Weyl semimetallic (WSM) candidate Eu2Ir2O7. In addition, the all-in-all-out/all-out-all-in antiferromagnetic domains of Ir4+ sublattice is verified using the field cooled magnetoresistance measurements at 2 K. Hall resistivity analysis indicate semimetallic hole carrier type dominance near the Fermi level up to the measured temperature range of 2-120 K. Altogether, our study reveals the ground state of stoichiometric Eu2Ir2O7 (111) thin film, with an indirect tuning of the off-stoichiometry using thickness of the samples, which is of interest in the search of the predicted 3D WSM phase.

Item Type: Journal Article
Publication: Journal of Physics Condensed Matter
Publisher: IOP Publishing Ltd
Additional Information: The copyright for this article belongs to the IOP Publishing Ltd.
Keywords: Annealing; Film growth; Film thickness; Ground state; Magnetoresistance; Stoichiometry; Temperature; Thick films; Thin films; Tuning; Yttria stabilized zirconia, Epitaxial thin films; Magnetoresistance; Postannealing; Pyrochlore iridate; Pyrochlores; Semimetallics; Solid phase epitaxy; Spin structures; Thin-films; Weyl semimetal, Epitaxial growth
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 24 Jun 2022 11:46
Last Modified: 24 Jun 2022 11:46
URI: https://eprints.iisc.ac.in/id/eprint/73682

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