Abstract:We report ultrasound velocity and magnetostriction results for the orthogonal-dimer antiferromagnet SrCu2(BO3)2 up to the saturation magnetic field. In addition to anomalies that can be associated to plateaus with fractional magnetization M/Ms = 1/8, 1/4, 1/3, 2/5, and 1/2, we have detected higher-field sound-velocity and magnetostriction anomalies at 116, 127, and 139 T. Strikingly, the anomalies of the sound velocity of the c66 acoustic mode are very much plateau dependent, with a huge decrease by −50% in th… Show more
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