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Study on the giant positive magnetoresistance and Hall effect in ultrathin graphite flakes
Author(s) -
Vansweevelt Rob,
Mortet Vincent,
D'Haen Jan,
Ruttens Bart,
Van Haesendonck Chris,
Partoens Bart,
Peeters François M.,
Wagner Patrick
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201001206
Subject(s) - graphite , magnetoresistance , graphene , mesoscopic physics , condensed matter physics , materials science , magnetic field , exfoliated graphite nano platelets , electrical resistivity and conductivity , hall effect , hexagonal crystal system , nanotechnology , composite material , physics , chemistry , crystallography , quantum mechanics
In this paper, we report on the electronic transport properties of mesoscopic, ultrathin graphite flakes with a thickness corresponding to a stack of 150 graphene layers. The graphite flakes show an unexpectedly strong positive magnetoresistance (PMR) already at room temperature, which scales in good approximation with the square of the magnetic field. Furthermore, we show that the resistivity is unaffected by magnetic fields oriented in plane with the graphene layers. Hall effect measurements indicate that the charge carriers are p‐type and their concentration increases with increasing temperature while the mobility is decreasing. The Hall voltage is non‐linear in higher magnetic fields. Possible origins of the observed effects are discussed.Ball and stick model of the two topmost carbon layers of the hexagonal graphite structure.