We present ultrasonic attenuation and elastic constant results on the heavy-fermion state of URu2Si2 both as a function of temperature and magnetic fields up to 50 T. We find distinct anomalies as a function of field and temperature for the longitudinal modes c11 and c33. We construct a B--T phase diagram including TN (B), the so-called metamagnetic transition and the spin-flop transition into the paramagnetic phase.
PACS numbers: 75.30.Mb, 74.25.Ld, 43.35.+d
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