Ferroelectric phase transition in EBTO thin films using second harmonic generation

Europium Barium Titanate (Eu$_{0.5}$Ba$_{0.5}$TiO$_{3}$) or EBTO in bulk form is a novel single-phase multiferoic material that exhibits ferroelectric (Curie temp $\sim$ 213K) and G-type antiferromagnetic (Neel temp $\sim$ 1.9K) properties. Oxygen vacancies have been shown to play a role in room temperature ferromagnetism (HfO$_2$, ZnO, TiO$_2$) and have been reported to increase the Curie temperature of EuO films. EBTO films were grown on SrTiO$_3$ (STO) substrates by pulsed laser deposition (PLD). We performed a temperature dependence study using second harmonic generation (SHG) and found the SHG signal to change as a function of temperature indicating a phase tranistion from paraelectric to ferroelectric in these EBTO films.