Record‐Breaking Magnetoresistance at the Edge of a Microflake of Natural Graphite

Placing several electrodes at the edge of a micrometer‐sized Sri Lankan natural graphite sample at distances comparable to the size of the internal crystalline regions, record values for the change of the resistance with magnetic field are found. At low temperatures and at B∼21 T, the magnetoresista...

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Bibliographic Details
Published in:Advanced engineering materials 2019-12, Vol.21 (12), p.n/a
Main Authors: Precker, Christian E., Barzola-Quiquia, José, Esquinazi, Pablo D., Stiller, Markus, Chan, Mun K., Jaime, Marcelo, Zhang, Zhipeng, Grundmann, Marius
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
High Magnetic Field
Internal Interfaces
Magnetoresistance
Natural Graphite
natural graphites
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Summary:Placing several electrodes at the edge of a micrometer‐sized Sri Lankan natural graphite sample at distances comparable to the size of the internal crystalline regions, record values for the change of the resistance with magnetic field are found. At low temperatures and at B∼21 T, the magnetoresistance (MR) reaches ≈107 %. The MR values exceed by far all earlier reported ones for graphite and they are comparable or even larger (at T > 50 K) than the largest reported in solids including the Weyl semimetals. The origin of this large MR lies in the existence of highly conducting 2D interfaces aligned parallel to the graphene planes. The magnetoresistance measured at the edges of a micrometer‐sized natural graphite sample shows values of the order or higher than the largest published in (nonsuperconducting) solids at 21 T applied field and at 0.48 K.
ISSN:1438-1656
1527-2648
DOI:10.1002/adem.201900991