Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-11-17
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 8 figures; Appendix added,To appear in Phys Rev. B
Scientific paper
Temperature and magnetic field studies of the elastic constants of the chromium spinel CdCr_2O_4 show pronounced anomalies related to strong spin-phonon coupling in this frustrated antiferromagnet. A detailed comparison of the longitudinal acoustic mode propagating along the [111] direction with theory based on an exchange-striction mechanism leads to an estimate of the strength of the magneto-elastic interaction. The derived spin-phonon coupling constant is in good agreement with previous determinations based on infrared absorption. Further insight is gained from intermediate and high magnetic field experiments in the field regime of the magnetization plateau. The role of the antisymmetric Dzyaloshinskii-Moriya interaction discussed and we compare the spin-phonon coupling in CdCr_2O_4 in both the ordered and disordered states.
Bhattacharjee Subhro
Chiatti Olivio
Lemmens Peter
Loidl Alois
Moessner Richhild
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