Two-dimensional fluctuations and competing phases in the stripe-like antiferromagnet BaCoS\(_2\)

By means of a combined x-ray diffraction, magnetic susceptibility and specific heat study, we investigate the interplay between orthorhombic distortion and stripe-like antiferromagnetic (AFM) order in the Mott insulator BaCoS\(_{2}\) at \(T_N=290\) K. The data give evidence of a purely electronic AF...

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Bibliographic Details
Published in:arXiv.org 2023-06
Main Authors: Abushammala, Haneen, Lenz, Benjamin, Baptiste, Benoit, Santos-Cottin, David, Toulemonde, Pierre, Casula, Michele, Klein, Yannick, Gauzzi, Andrea
Format: Article
Language:English
Subjects:
Antiferromagnetism
Broken symmetry
Magnetic permeability
Playgrounds
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Summary:By means of a combined x-ray diffraction, magnetic susceptibility and specific heat study, we investigate the interplay between orthorhombic distortion and stripe-like antiferromagnetic (AFM) order in the Mott insulator BaCoS\(_{2}\) at \(T_N=290\) K. The data give evidence of a purely electronic AFM transition with no participation of the lattice. The observation of large thermal fluctuations in the vicinity of \(T_N\) and a Schottky anomaly unveils competing ground states within a minute \(\sim\)1 meV energy range that differ in the orbital and spin configurations of the Co ions. This interpretation suggests that the stripe-like order results from a spontaneous symmetry breaking of the geometrically frustrated pristine tetragonal phase, which offers an ideal playground to study the driving force of multi-orbital Mott transitions without the participation of the lattice.
ISSN:2331-8422