Journal
ADVANCED ENGINEERING MATERIALS
Volume 21, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201900991
Keywords
high magnetic field; internal Interfaces; magnetoresistance; natural graphites
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Funding
- Brazilian National Council for the Improvement of Higher Education (CAPES) [99999.013188/2013-05]
- DAAD [57207627]
- DFG [ES 86/29-1]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [31047526-SFB 762]
- US Department of Energy
- State of Florida
- National Science Foundation [DMR 1157490, DMR 1644779]
- US Department of Energy BES Science at 100 T grant, Division of Materials Science and Engineering
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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 similar to 21 T, the magnetoresistance (MR) reaches approximate to 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.
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