Soundwave Anomalies in SrCu_{2}(BO_{3})_{2}

Details Soundwave Anomalies in SrCu_{2}(BO_{3})_{2} Soundwave Anomalies in SrCu_{2}(BO_{3})_{2}

2000-05-02

arxiv.org/abs/cond-mat/0005052v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.62.R6097

The temperature and high magnetic field dependence of the longitudinal soundwave mode c_{11} in the two dimensional dimer system SrCu_{2}(BO_{3})_{2} is presented. c_{11}(T) shows anomalies due to strong interdimer spin-strain coupling. We can quantitatively interpret the temperature dependence of c_{11}(T) together with the magnetic susceptibility $\chi_{m}(T)$ with a molecular field approximation of coupled dimer triplets. The sound velocity up to 50T shows very sharp softening between the magnetization plateaus at low temperature. We argue that these pronounced effects arise from a resonant interaction between the phonons and the magnetic excitations which show softening between the plateaus.

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