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Polar metal phase stabilized in strained La-doped BaTiO3films.
Scientific Reports ( IF 3.8 ) Pub Date : 2017-07-05 , DOI: 10.1038/s41598-017-04635-3
K. S. Takahashi , Y. Matsubara , M. S. Bahramy , N. Ogawa , D. Hashizume , Y. Tokura , M. Kawasaki

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 the polar state occurs in low-La-doped films. This intriguing behaviour is effectively explained by our first-principles calculations. Our demonstration suggests that the carrier doping to ferroelectric material with epitaxial strain serves as a new way to explore polar metals.
更新日期:2017-07-05
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