ISIS Neutron and Muon Source Data Journal

In quest of the ground state of a potential Kitaev triangular lattice ErCuSe2

Abstract: Rare-earth-based triangular systems in the Delafossite family with dominant Kitaev exchange are rare; CsCeSe2 and KCeSe2 are the only two known compounds. However, the superexchange angle is quite away from 90 degrees, indicating a reduction of Kitaev exchange and an enhancement of non-Kitaev terms. We have synthesized a new Delafossite system, ErCuSe2, in a single-crystalline form, with a superexchange angle of 91.13 degree, much smaller than those of the other two compounds. Magnetization and heat capacity measurements indicate a magnetic ordering at 0.65 K with strong easy plane anisotropy. Moreover, the lowest-lying crystal electric field (CEF) is about 35 K, as estimated from thermodynamic measurements. Thus, the spin configuration of the ordered state and also the CEF information will be necessary to establish ErCuSe2 as a Jeff = 1/2 system, with dominant Kitaev exchange.

Principal Investigator: Professor Mayukh Majumder
Local Contact: Dr Duc Le
Experimenter: Dr Devashi Adroja

DOI: 10.5286/ISIS.E.RB2620437

ISIS Experiment Number: RB2620437

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Professor Mayukh Majumder et al; (2026): In quest of the ground state of a potential Kitaev triangular lattice ErCuSe2, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620437

Data is released under the CC-BY-4.0 license.