Superconductivity at epitaxial LaTiO3-KTaO3 interfaces

Maryenko, D.; Maznichenko, I. V.; Ostanin, S.; Kawamura, M.; Takahashi, K. S.; Nakamura, M.; Dugaev, V. K.; Sherman, E. Ya.; Ernst, A.; Kawasaki, M.

doi:10.1063/5.0151227

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Superconductivity at epitaxial LaTiO₃-KTaO₃ interfaces

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Ernst, A.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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061102_1_5.0151227.pdf
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引用

Maryenko, D., Maznichenko, I. V., Ostanin, S., Kawamura, M., Takahashi, K. S., Nakamura, M., Dugaev, V. K., Sherman, E. Y., Ernst, A., & Kawasaki, M. (2023). Superconductivity at epitaxial LaTiO₃-KTaO₃ interfaces. APL Materials, 11(6):. doi:10.1063/5.0151227.

引用: https://hdl.handle.net/21.11116/0000-000D-7118-9

要旨

The design of epitaxial interfaces is a pivotal way to engineer artificial structures where new electronic phases can emerge. Here, we report a systematic emergence of an interfacial superconducting state in epitaxial heterostructures of LaTiO₃ and KTaO₃. The superconductivity transition temperature increases with decreasing thickness of LaTiO₃. Such a behavior is observed for both (110) and (111) crystal oriented structures. For thick samples, the finite resistance developing below the superconducting transition temperature increases with increasing LaTiO₃ thickness. Consistent with previous reports, the (001) oriented heterointerface features a high electron mobility of 250 cm2 V⁻¹ s⁻¹ and shows no superconducting transition down to 40 mK. Our results imply a non-trivial impact of LaTiO₃ on the superconducting state and indicate how superconducting KTaO₃ interfaces can be integrated with other oxide materials.