Effect of dc bias on the Curie–Weiss exponent in 0.76Pb(Mg1∕3Nb2∕3)O3–0.24PbTiO3 ferroelectric single crystal

Abstract

Permittivity versus temperature characteristics and Curie–Weiss exponent (CWE) γ in the universal Curie–Weiss law [ε−1=εm−1[1+(T−Tc)γ∕(2δ2)](1⩽γ⩽2)] as a function of dc bias field were obtained for ⟨001⟩, ⟨011⟩, and ⟨111⟩ oriented 0.76Pb(Mg1∕3Nb2∕3)O3–0.24PbTiO3 single crystals. Results indicated that γ is a function of dc bias field and three different oriented crystals show slight different γ values but the similar dc field dependence.