Anomalous pressure dependence of the Curie point of nickel fluosilicate
А. А. ГалкинPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. M. VitebskiĭPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskV. DyakonovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. FitaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskG. A. TsintsadzePhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk
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The effect of hydrostatic pressure of up to 9 kbar on the Curie point of nickel fluosilicate was investigated. The derivative dTc/dP in this pressure region changes sign twice—at the triple point (Pc =1.3 kbar, Tc = 0.12 °K and at a pressure of P = 5.8 kbar. The complex nature of the dependence of Tc on P is due to the competition between the exchange interaction and single-ion anisotropy.
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