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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Suppression of geometric frustration by magnetoelastic coupling in AuCrS2

Résumé

We studied the structural, magnetic, and electronic properties of the geometrically frustrated layered AuCrS2 system by means of x-ray and neutron powder diffraction, specific heat, dc magnetization, and dc electrical resistivity measurements. The room-temperature structural refinement is consistent with a hexagonal centrosymmetric R-3m symmetry and with formal valence states Au+ and Cr3+, where the Cr3+ ions form a regular triangular lattice within the hexagonal planes. On cooling, we observe a first-order structural phase transition to a monoclinic C2/m symmetry concomitant to an antiferromagnetic order at TN = 47 K. The atomic displacements associated with this transition stretch the triangular lattice, thus suppressing the geometric frustration. This accounts for the magnetic order observed and gives evidence of a large magnetoelastic coupling. The refined magnetic structure is commensurate and consists of double ferromagnetic chains along the stretching direction with μ = 2.54 μB/Cr3+; the residual frustration stabilizes an elegant pattern of alternate ferromagnetic and antiferromagnetic intra- and interplane couplings between adjacent chains. The electrical transport of our sintered powder samples is found to be semiconducting-like with ρ300K ∼ 157 cm and an activation energy of 0.38 eV.
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hal-00641317 , version 1 (15-11-2011)

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S. J. E. Carlsson, G. Rousse, I. Yamada, H. Kuriki, R. Takahashi, et al.. Suppression of geometric frustration by magnetoelastic coupling in AuCrS2. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 84, pp.094455. ⟨10.1103/PhysRevB.84.094455⟩. ⟨hal-00641317⟩
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