Abstract
We report the magnetization curve under magnetic fields H up to 30 T at low temperatures in a tetrahedral spin-chain system Cu3Mo2O9 single crystal. This material shows successive phase transitions to an antiferromagnetic phase at TN = 7.9 K and a weak ferromagnetic (WF) phase at Tc ≊ 2.5 K in low magnetic fields. As the magnetic field increases below TN two rapid increases in magnetization occur at 0 – 0.1 and 19.3 T for H//a and 0.3 – 0.8 and 17.5 T for H//c. However, these increases do not occur for H//b. These facts refute the conventional spin flop transition. The rapid increases disappear above TN. The magnetic moments are canted toward the ac plane by the Dzyaloshinskii-Moriya interaction in the WF phase. Consequently, these rapid increases in magnetization at high magnetic fields are interpreted by sudden rotations of the WF moments around the b axis.
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