Novel electronic structure induced by a highly strained oxide interface with incommensurate crystal fields

Abstract

The misfit oxide, Bi${}_2$Ba${}_{1.3}$K${}_{0.6}$Co${}_{2.1}$O${}_y$, made of alternating rocksalt-structured [BiO/BaO] layers and hexagonal CoO${}_2$ layers, was studied by angle-resolved photoemission spectroscopy. Detailed electronic structure of such a highly strained oxide interfaces is revealed for the first time. We found that under the two incommensurate crystal fields, electrons are confined within individual sides of the interface, and scattered by umklapp scattering of the crystal field from the other side. In addition, the high strain on the rocksalt layer raises its chemical potential and induces large charge transfer to the CoO${}_2$ layer. Furthermore, a novel interface effects, the interfacial enhancement of electron-phonon interactions, is discovered. Our findings of these electronic properties lay a foundation for designing future functional oxide interfaces.

5 pages, 4 figures

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Cited by in corpus (5)

• Critical role of substrate in the high temperature superconductivity of single layer FeSe on Nb:BaTiO${}_3$
• Charge Transfer Effects in Naturally Occurring van der Waals Heterostructures (PbSe)1.16(TiSe2)m (m=1, 2)
• Experimental study of the incoherent spectral weight in the photoemission spectra of the misfit cobaltate [Bi2Ba2O4][CoO2]2
• New electronic orderings observed in cobaltates under the influence of misfit periodicities
• Anomalous band renormalization due to high energy $kink$ in the colossal thermoelectric material K${}_{0.65}$RhO${}_2$