Polar metal phase stabilized in strained La-doped BaTiO₃films.

ABSTRACT: Ferroelectric polarization and metallic conduction are two seemingly irreconcilable properties that cannot normally coexist in a single system, as the latter tends to screen the former. Polar metals, however, defy this rule and have thus attracted considerable attention as a new class of ferroelectrics exhibiting novel properties. Here, we fabricate a new polar metal film based on the typical ferroelectric material BaTiO₃by combining chemical doping and epitaxial strain induced by a substrate. The temperature dependences of the c-axis lattice constant and the second harmonic generation intensity of La-doped BaTiO₃films indicate the existence of polar transitions. In addition, through La doping, films become metallic at the polar phase, and metallicity enhancement at t

SUBMITTER: Takahashi KS 

PROVIDER: S-EPMC5498685 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature