Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: Superconductivity: Properties and Electronic Structure

TT 57.10: Vortrag

Donnerstag, 4. April 2019, 17:30–17:45, H7

Interfaces in Graphite: A Path to Room Temperature Superconductivity — •Pablo D. Esquinazi — Division of Superconductivity and Magnetism, University of Leipzig, Leipzig, Germany

Galvanomagnetic, Magnetization and Magnetic Force Microscopy studies in different graphite samples, from twisted graphene bilayers to bulk graphite samples, indicate that interfaces (e.g., between twisted Bernal or twisted rhombohedral crystalline regions or between Bernal and rhombohedral stacking) are the reason for the superconducting and metallic-like properties of graphite. In this contribution we emphasize and discuss the similarities in the superconducting-like signals obtained in twisted graphene bilayers [1] with critical temperature Tc ∼ 1 K, in TEM lamella [2] and in bulk graphite samples [3] with 3 K  Tc 350 K. Experimental as well as theoretical work indicate that the origin of the observed superconductivity is related to the existence of flat bands at certain interfaces.
Y. Cao et al., Nature 556, 1476 (2018)
A. Ballestar et al., New Journal of Physics 15, 023024 (2013)
C. Precker et al., New Journal of Physics 18, 113041 (2016)

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