Magnetically induced phonon splitting in ACr${}_2$O${}_4$ spinels from first principles

Abstract

We study the magnetically-induced phonon splitting in cubic ACr${}_2$O${}_4$ (A=Mg, Zn, Cd, Hg) spinels from first principles, and demonstrate that the sign of the splitting, which is experimentally observed to be opposite in CdCr${}_2$O${}_4$ compared to ZnCr${}_2$O${}_4$ and MgCr${}_2$O${}_4$, is determined solely by the particular magnetic ordering pattern observed in these compounds. We further show that this interaction between magnetism and phonon frequencies can be fully described by the previously proposed spin-phonon coupling model that includes only the nearest neighbor exchange. Finally, using this model with materials specific parameters calculated from first principles, we provide additional insights into the physics of spin-phonon coupling in this intriguing family of compounds.

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Cited by in corpus (5)

• Electromagnon dispersion probed by inelastic x-ray scattering
• Spin--lattice coupling and the emergence of the trimerized phase in the $S=1$ Kagome antiferromagnet Na${}_2$Ti${}_3$Cl${}_8$
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Lattice dynamics and magnetic exchange interactions in GeCo2O4, a spinel with S = 1/2 pyrochlore lattice
• Spin-phonon interactions and magnetoelectric coupling in Co${}_4$$B_2$O${}_9$ ($B$ = Nb, Ta)