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Broken parity and a chiral ground state in the frustrated magnet CdCr$_2$O$_4$ | | Gia-Wei Chern
; C. J. Fennie
; O. Tchernyshyov
; | | Date: |
1 Jun 2006 | | Subject: | Strongly Correlated Electrons; Materials Science | | Abstract: | We present a model describing the lattice distortion and incommensurate magnetic order in the spinel CdCr$_2$O$_4$, 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 stablizes a collinear magnetic order with the propagation wavevector ${f q}=2pi(0,0,1)$. 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 ${f q}$ shifted to $2pi(0,delta,1)$. | | Source: | arXiv, cond-mat/0606039 | | Services: | Forum | Review | PDF | Favorites | |
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