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.File | Dimensione | Formato | |
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