Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 25, Issue 46, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/46/466004
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Funding
- FAPESP
- CNPq
- CAPES
- ROBOCON
- INCT NAMITEC
- European Union [NMP3-SL-2011-263104-HINTS]
- UNICAMP visiting professorship programme
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We report a highly anisotropic in-plane magnetoresistance (MR) in graphite that possesses in-plane parallel line-like structural defects. In a current direction perpendicular to the line defects (LD), MR is negative and linear in low fields with a crossover to a positive MR at higher fields, while in a current direction parallel to LD, we observed a giant super-linear positive MR. These extraordinary MRs are respectively explained by a hopping magnetoresistance via non-zero angular momentum orbitals, and by the magnetoresistance of inhomogeneous media. The linear negative orbital MR is a unique signature of the broken time-reversal symmetry (TRS). We discuss the origin of the disorder-induced TRS-breaking in graphite.
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