Abstract
We propose to use the combination of the polarized neutron facility and the anvil high-pressure cell for investigation of magnetic phase transitions in solids. The magnetic phase transition manifests itself in the rise or loss of neutron depolarization. Neutron depolarization in Fe 70Ni 30 alloy and MnAs under high pressure was studied. Phase transitions from ferromagnetic state to paramagnetic state and vice versa were detected. Ferromagnetic state of MnAs at pressure of about 80 kbar was observed at room temperature.
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