NILSEN, G. J.; OKAMOTO, Y.; ISHIKAWA, H.; SIMONET, Virginie; COLIN, Claire; CANO, Andres; CHAPON, L. C.; HANSEN, T.; MUTKA, H.; HIROI, Z.

doi:10.1103/PhysRevB.89.140412

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NILSEN, G. J.
Institut Laue-Langevin [ILL]

OKAMOTO, Y.
Institute for Solid State Physics

ISHIKAWA, H.
Institute for Solid State Physics

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2014, vol. 89, n° 14, p. 140412(R)

American Physical Society

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Several Cu2+ hydroxide minerals have been recently identified as candidate realizations of the S=1/2 kagome Heisenberg model. In this context, we have studied the distorted system KCu3As2O7(OD)3 using neutron scattering and bulk measurements. Although the distortion favors magnetic order over a spin liquid ground state, refinement of the magnetic diffraction pattern below TN1=7.05(5) K yields a complex helical structure with k=(0.77,0,0.11). This structure, as well as the spin excitation spectrum, are well described by a classical Heisenberg model with ferromagnetic nearest neighbor couplings. Multiferroicity is observed below TN1, with an unusual crossover between improper and pseudoproper behavior occurring at TN2=5.5 K. The polarization at T=2 K is P=1.5μCm−2. The properties of KCu3As2O7(OD)3 highlight the variety of physics which arise from the interplay of spin and orbital degrees of freedom in Cu2+ kagome systems.< Réduire

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Helical order and multiferroicity in the S = 1/2 quasi-kagome system KCu3As2O7(OD)3

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