DAMAY, Françoise; POIENAR, Maria; MARTIN, Christine; MAIGNAN, Antoine; RODRIGUEZ-CARJAVAL, Juan; ANDRÉ, Gilles; DOUMERC, Jean-Pierre

doi:10.1103/PhysRevB.80.094410

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DAMAY, Françoise
Laboratoire Léon Brillouin [LLB - UMR 12]

POIENAR, Maria
Laboratoire de cristallographie et sciences des matériaux [CRISMAT]

MARTIN, Christine
Laboratoire de cristallographie et sciences des matériaux [CRISMAT]

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2009, vol. 80, n° 9, p. 094410

American Physical Society

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The crystal and magnetic structures of the layered oxide crednerite CuMnO2 have been studied by neutron powder diffraction. In this system, which is topologically representative of a frustrated square lattice with nearest (J1) and diagonal next-nearest- (J2) neighbor interactions, three-dimensional antiferromagnetic ordering is observed below TN=65 K, with propagation vector k1=(−1/21/21/2). Frustration is relieved through a strong magnetoelastic coupling to the lattice, evidenced by a structural phase transition from a monoclinic (C2/m) to a strained triclinic C1̅ phase as magnetic order sets in. The magnetic order observed, which is described as spins antiferromagnetically aligned along [1-1 0] and ferromagnetically aligned along [1 1 0], corresponds to the so-called collinear antiferromagnetic order predicted for a frustrated two-dimensional antiferromagnetic Heisenberg model on a square lattice for J2/J1>0.5 in the presence of spin-lattice coupling.< Réduire

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Spin-lattice coupling induced phase transition in theS=2 frustrated antiferromagnet CuMnO<sub>2</sub>

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