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We report on infrared, Raman, magnetic susceptibility, and specific heatmeasurements on CdCr2O4 and ZnCr2O4 single crystals. We estimate thenearest-neighbor and next-nearest neighbor exchange constants from the magneticsusceptibility and extract the spin-spin correlation functions obtained fromthe magnetic susceptibility and the magnetic contribution to the specific heat.By comparing with the frequency shift of the infrared optical phonons above TN, we derive estimates for the spin-phonon coupling constants in these systems.The observation of phonon modes which are both Raman and infrared activesuggest the loss of inversion symmetry below the Neel temperature in CdCr2O4 inagreement with theoretical predictions by Chern and coworkers [Phys. Rev. B 74,060405 (2006)]. In ZnCr2O4 several new modes appear below TN, but no phononmodes could be detected which are both Raman and infrared active indicating theconservation of inversion symmetry in the low temperature phase.

Optical phonons, spin correlations, and spin-phonon coupling in the frustrated pyrochlore magnets CdCr2O4 and ZnCr2O4