Open AccessHuge magnetoresistance effect of highly oriented pyrolytic graphite
Author(s) -
Youwei Du,
Zhiming Wang,
Gang Ni,
Xing Ding-Yu,
Qingyu Xu
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.1191
Subject(s) - magnetoresistance , graphite , highly oriented pyrolytic graphite , pyrolytic carbon , condensed matter physics , semimetal , materials science , insulator (electricity) , magnetic field , colossal magnetoresistance , physics , chemistry , metallurgy , optoelectronics , organic chemistry , quantum mechanics , pyrolysis , band gap
Graphite is a quasi-two-dimensional semimetal. However, for usual graphite the magnetoresistance is not so high due to its small crystal size and no preferred orientation. Huge positive magnetoresistance up to 85300% at 4.2 K and 4950% at 300 K under 8.15 T magnetic field was found in highly oriented pyrolytic graphite. The mechanism of huge positive magnetoresistance is not only due to ordinary magnetoresistance but also due to magnetic-field-driven semimetal-insulator transition.