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

Journal Article · 11 November 2019 · Advanced Engineering Materials

DOI: https://doi.org/10.1002/adem.201900991 · OSTI ID:1660594

Precker, Christian E. ^[1]; Barzola-Quiquia, José ^[1]; Esquinazi, Pablo D. ^[1]; Stiller, Markus ^[1]; Chan, Mun K. ^[2]; Jaime, Marcelo  ^[2]; Zhang, Zhipeng ^[3]; Grundmann, Marius ^[3]

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1. Univ. of Leipzig (Germany). Felix Bloch Institute, Div. of Superconductivity and Magnetism
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab), Pulsed Field Facility
3. Univ. of Leipzig (Germany). Felix Bloch Institute, Semiconductor Physics Group

Placing several electrodes at the edge of a micrometer-size Sri Lankan natural graphite sample at distances comparable to the size of the internal crystalline regions, we found record values for the change of the resistance with magnetic field. 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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: 89233218CNA000001
• OSTI ID: 1660594
• Report Number(s): LA-UR-19-25219; TRN: US2203530
• Journal Information: Advanced Engineering Materials, Vol. 21, Issue 12; ISSN 1438-1656
• Publisher: WileyCopyright Statement
• Country of Publication: United States
• Language: English