Abstract

A large magneto-volume effect is found in liquid-phase oxygen. The volume expansion Δ V / V 0 is 2.2×10 -4 under the field of 80 kOe, which is about ten times larger than that in ferromagnetic Fe, Co or Ni metals. The effect is understood by the exchange repulsion between O 2 spins polarized by an external magnetic field. The contribution of the magneto-volume effect to field-induced transparency is discussed.

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