Spin phonon coupling in frustrated magnet CdCr${}_2$O${}_4$

Abstract

The infrared phonon spectrum of the spinel CdCr2O4 is measured as a function temperature from 6 K to 300K. The triply degenerate Cr phonons soften in the paramagnetic phase as temperature is lowered below 100 K and then split into a singlet and doublet in the low T antiferromagnetic phase which is tetragonally distorted to relieve the geometric frustration in the pyrochlore lattice of Cr${}^{3+}$ ions. The phonon splitting is inconsistent with the simple increase (decrease) in the force constants due to deceasing (increasing) bond lengths in the tetragonal phase. Rather they correspond to changes in the force constants due to the magnetic order in the antiferromagnetic state. The phonon splitting in this system is opposite of that observed earlier in ZnCr2O4 as predicted by theory. The magnitude of the splitting gives a measure of the spin phonon coupling strength which is smaller than in the case of ZnCr2O4.

4.2 pages, 4 figures, 1 reference added, submmited

References in corpus (10)

• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• Order by distortion and string modes in pyrochlore antiferromagnet
• Probing spin correlations with phonons in the strongly frustrated magnet ZnCr2O4
• Statics and dynamics of an incommensurate spin order in a geometrically frustrated antiferromagnet CdCr${}_2$O${}_4$
• Spin-Peierls phases in pyrochlore antiferromagnets
• Magnetic-induced phonon anisotropy in ZnCr${}_2$O${}_4$ from first principles
• Spin-phonon coupling in antiferromagnetic chromium spinels
• IR Phonon signatures of multiferroicity in TbMn${}_2$O${}_5$
• Broken parity and a chiral ground state in the frustrated magnet CdCr2O4
• Neel to Spin-Glass-like Phase Transition versus Dilution in Geometrically Frustrated ZnCr_{2-2x}Ga_{2x}O_4

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