Granular superconductivity below 5~K in SPI-II pyrolytic graphite
Ana Ballestar, Pablo Esquinazi, Winfried B\"ohlmann
TL;DR
This study investigates granular superconductivity below 5 K in SPI-II pyrolytic graphite, revealing that interface differences in TEM lamellae influence the superconducting properties.
Contribution
It provides evidence of granular superconductivity in SPI-II pyrolytic graphite and links interface structure to the observed superconducting behavior.
Findings
Superconductivity observed below 5 K in SPI-II graphite
Interfaces in TEM lamellae differ from more ordered samples
Interface structure influences superconducting temperature
Abstract
We have studied the transport properties of transmission electron microscope (TEM) lamellae obtained from a pyrolytic graphite sample of grade B (SPI-II) with electrical contacts at the edges of the graphene layers. The temperature, magnetic field, input current dependence of the resistance as well as the current-voltage characteristic curves are compatible with the existence of granular superconductivity below 5~K. TEM pictures of the studied lamellae reveal clear differences of the embedded interfaces to those existing in more ordered pyrolytic samples, which appear to be the origin for the relatively lower temperatures at which the granular superconductivity is observed.
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