Is Ba3In2O6a high-Tc superconductor?

Hensling, F V E;Dahliah Diana;Smeaton, M A;Shrestha, B;Schlom, D G;et.al.
(2024) Journal of Physics: Condensed Matter — Vol. 36, n° 31, p. 315602 (2024)

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  • Hensling, F V Eorcid-logoDepartment of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, United States of America
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  • Dahliah DianaUCLouvain
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  • Smeaton, M Aorcid-logoDepartment of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, United States of America
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  • Shrestha, Borcid-logoDepartment of Physics and Astronomy, University of Toledo, Toledo, OH 43606, United States of America
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  • Rignanese, Gian-Marcoorcid-logoUCLouvain
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  • Hautier, Geoffroyorcid-logoUCLouvain
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  • Schlom, D GDepartment of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, United States of America
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Abstract
It has been suggested that Ba3In2O6 might be a high-Tc superconductor. Experimental investigation of the properties of Ba3In2O6 was long inhibited by its instability in air. Recently epitaxial Ba3In2O6 with a protective capping layer was demonstrated, which finally allows its electronic characterization. The optical bandgap of Ba3In2O6 is determined to be 2.99 eV in-the (001) plane and 2.83 eV along the c-axis direction by spectroscopic ellipsometry. First-principles calculations were carried out, yielding a result in good agreement with the experimental value. Various dopants were explored to induce (super-)conductivity in this otherwise insulating material. Neither A- nor B-site doping proved successful. The underlying reason is predominately the formation of oxygen interstitials as revealed by scanning transmission electron microscopy and first-principles calculations. Additional efforts to induce superconductivity were investigated, including surface alkali doping, optical pumping, and hydrogen reduction. To probe liquid-ion gating, Ba3In2O6 was successfully grown epitaxially on an epitaxial SrRuO3 bottom electrode. So far none of these efforts induced superconductivity in Ba3In2O6, leaving the answer to the initial question of whether Ba3In2O6 is a high-Tc superconductor to be 'no' thus far.
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Hensling, F. V. E., Dahliah Diana, Smeaton, M. A., Shrestha, B., Show, V., Parzyck, C. T., Hennighausen, C., Kotsonis, G. N., Rignanese, G.-M., Barone, M. R., Subedi, I., Disa, A. S., Shen, K. M., Faeth, B. D., Bollinger, A. T., Božović, I., Podraza, N. J., Kourkoutis, L. F., Hautier, G., & Schlom, D. G. (2024). Is Ba3In2O6a high-Tc superconductor? Journal of Physics: Condensed Matter, 36(31), 315602. https://doi.org/10.1088/1361-648x/ad42f3 (Original work published 2024)