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VOLUME 35 (1982) | ISSUE 9 | PAGE 384
Anomalies in the magnetic properties of nickel fluorosilicate at high pressures and ultralow temperatures
The effect of pressure on the temperature and nature of the magnetic ordering in NiSiF6«6H20 has been studied for the first time. A P-T phase diagram has been constructed. A region in which a paramagnetic phase is stable and regions in which two ferromagnetic phases are stable touch at a triple point on this phase diagram, and the derivative dTc/dP changes sign at this point. The two ferromagnetic phases are an easy-axis phase and an easy-plane phase.