At T-N similar or equal to 300K the layered insulator BaCoS2 transitions to a columnar antiferromagnet that signals non-negligible magnetic frustration despite the relatively high T-N, all the more surprising given its quasi two-dimensional structure. Here, we show, by combining ab initio and model calculations, that the magnetic transition is an order-from-disorder phenomenon, which not only drives the columnar magnetic order, but also the inter-layer coherence responsible for the finite N & eacute;el transition temperature. This uncommon ordering mechanism, actively contributed by orbital degrees of freedom, hints at an abundance of low energy excitations above and across the N & eacute;el transition, in agreement with experimental evidence.

Order from disorder phenomena in BaCoS2 / Lenz, Benjamin; Fabrizio, Michele; Casula, Michele. - In: COMMUNICATIONS PHYSICS. - ISSN 2399-3650. - 7:1(2024), pp. 1-9. [10.1038/s42005-023-01514-4]

Order from disorder phenomena in BaCoS2

Fabrizio, Michele;Casula, Michele
2024-01-01

Abstract

At T-N similar or equal to 300K the layered insulator BaCoS2 transitions to a columnar antiferromagnet that signals non-negligible magnetic frustration despite the relatively high T-N, all the more surprising given its quasi two-dimensional structure. Here, we show, by combining ab initio and model calculations, that the magnetic transition is an order-from-disorder phenomenon, which not only drives the columnar magnetic order, but also the inter-layer coherence responsible for the finite N & eacute;el transition temperature. This uncommon ordering mechanism, actively contributed by orbital degrees of freedom, hints at an abundance of low energy excitations above and across the N & eacute;el transition, in agreement with experimental evidence.
2024
7
1
1
9
35
10.1038/s42005-023-01514-4
https://arxiv.org/abs/2302.12179
Lenz, Benjamin; Fabrizio, Michele; Casula, Michele
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/137370
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