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Field-induced spin density wave and spiral phases in a layered antiferromagnet

Abstract : We determine the low-field ordered magnetic phases of the S = 1 dimerized antiferromagnet Ba$_3$Mn$_2$O$_8$ using single-crystal neutron diffraction. We find that for magnetic fields between $\mu_0$$H$ = 8.80 T and 10.56 T applied along the [1$\bar 1$0] direction the system exhibits spin density wave order with incommensurate wave vectors of type ($\eta$,$\eta$,$\epsilon$). For $\mu_0$$H$ > 10.56 T, the magnetic order changes to a spiral phase with incommensurate wave vectors only along the [$hh$0] direction. For both field-induced ordered phases, the magnetic moments are lying in the plane perpendicular to the field direction. The nature of these two transitions is fundamentally different: the low-field transition is a second-order transition to a spin density wave ground state, while the one at higher field, toward the spiral phase, is of first order.
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https://hal-cea.archives-ouvertes.fr/cea-01745410
Contributor : Jérôme Planès <>
Submitted on : Wednesday, March 28, 2018 - 10:57:38 AM
Last modification on : Monday, July 20, 2020 - 2:02:01 PM

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M. B. Stone, M. D. Lumsden, V. O. Garlea, Beatrice Grenier, Eric Ressouche, et al.. Field-induced spin density wave and spiral phases in a layered antiferromagnet. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2015, 92, pp.020415. ⟨10.1103/PhysRevB.92.020415⟩. ⟨cea-01745410⟩

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