Broken parity and a chiral ground state in the frustrated magnet CdCr2O4

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Title: Broken parity and a chiral ground state in the frustrated magnet CdCr2O4
Author: Chern, G.-W.; Fennie, C.J.; Tchernyshyov, O.
Abstract: We present a model describing the lattice distortion and incommensurate magnetic order in the spinel CdCr2O4, a good realization of the Heisenberg 'pyrochlore' antiferromagnet. The magnetic frustration is relieved through the spin-Peierls distortion of the lattice involving a phonon doublet with odd parity. The distortion stabilizes a collinear magnetic order with the propagation wave vector q=2π(0,0,1). The lack of inversion symmetry makes the crystal structure chiral. The handedness is transferred to magnetic order by the relativistic spin-orbit coupling: the collinear state is twisted into a long spiral with the spins in the ac plane and q shifted to 2π(0,δ,1).
Date: 2006-08-01
Citation: Physical Review B (Condensed Matter and Materials Physics) 1 Aug. 2006, vol.74, no.6, pp. 60405-1-4
Subject: spin-orbit interactions
Heisenberg model
crystal structure
broken parity
chiral ground state
antiferromagnetic materials
cadmium compounds
lattice distortion
incommensurate magnetic order
Heisenberg pyrochlore antiferromagnet
magnetic frustration
spin-Peierls distortion
magnetic order
phonon doublet
chiral crystal structure
relativistic spin-orbit coupling

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