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Article Dans Une Revue The European Physical Journal. Special Topics Année : 2023

Two-dimensional fluctuations and competing phases in the stripe-like antiferromagnet BaCoS$_{2}$

Résumé

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.

Dates et versions

hal-04042781 , version 1 (23-03-2023)

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Citer

Jiuxiang Zhang, Zhesheng Chen, Jonathan Caillaux, Yannick Klein, Andrea Gauzzi, et al.. Two-dimensional fluctuations and competing phases in the stripe-like antiferromagnet BaCoS$_{2}$. The European Physical Journal. Special Topics, 2023, ⟨10.1140/epjs/s11734-022-00746-9⟩. ⟨hal-04042781⟩
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