Figure 2.

a) Specific heat divided by temperature C _p /T of EuAl₁₂O₁₉ as a function of temperature revealing a second order phase transition at T _S = 49 K and the ferromagnetic transition at T _C = 1.3 K. b) Dielectric permittivity of EuAl₁₂O₁₉ along the c axis measured at a frequency of f = 12 kHz as a function of temperature. The transition at T _S =49 K is clearly indicated by an abrupt change of slope. The red curve is a Curie–Weiss fit giving the large negative Curie–Weiss temperature of T _CW = −117 K. c) Pyroelectric current in black and polarization in red as a function of temperature. The crystal was initially cooled down to T = 2 K under an electric field of E _DC = 3.2 kV cm⁻¹ along the c axis. Then the pyroelectric current was measured upon heating at q = 1 K min⁻¹ in absence of electric field. It shows a strong reduction of the polarization around T ≈ 4 K followed by its suppression around  T _S= 49 K.