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

Abstract

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.

References in corpus (4)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Magnetization plateaus in spin chains: ``Haldane gap'' for half-integer spins
• Exact dimer ground state of the two dimensional Heisenberg spin system SrCu_2(BO_3)_2
• Various series expansions for a Heisenberg antiferromagnet model for SrCu${}_2$(BO${}_3$)${}_2$

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