Magnetic-induced phonon anisotropy in ZnCr$_2$O$_4$ from first principles

Details Magnetic-induced phonon anisotropy in ZnCr$_2$O$_4$ from first principles Magnetic-induced phonon anisotropy in ZnCr$_2$O$_4$ from first principles

2006-02-21

arxiv.org/abs/cond-mat/0602503v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.96.205505

We have studied the influence of magnetic order on the optical phonons of the geometrically frustrated spinel ZnCr$_2$O$_4$ from first-principles. By mapping the first-principles phonon calculations onto a Heisenberg-like model, we developed a method to calculate exchange derivatives and subsequently the spin-phonon couping parameter from first-principles. All calculations were performed within LSDA+U.

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