Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 103: Transport: Poster Session
TT 103.35: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster B
Transport measurements in graphite-like C3B and C3P — •Philip Brown1, Timothy King2, Peter Matthews2, Dominic Wright2, and Malte Grosche1 — 1Dept. of Physics, 19 J J Thomson Ave, Cambridge CB3 0HE, United Kingdom — 2Dept. of Chemistry, Lensfield Road, Cambridge CB2 1EW, United Kingdom
Heavily-doped graphitic materials are of both fundamental and practical interest. Pure bulk graphite is a semimetal exhibiting unusual linear magnetoresistance at low temperatures, and the Dirac point in monolayer graphene leads to a plethora of interesting physics. The effects of boron doping have been investigated theoretically in some detail.
C1−xBx is predicted to dramatically improve upon the already high Li ion storage of graphite, and may also have relevance as a functional material for fusion reactor cladding. The x = 0.25 compound C3B has been synthesised experimentally, and found to possess graphite’s hexagonal lattice and an ordered 2D structure. Despite extensive theoretical study, little experimental data is available on the properties of these heavily doped graphitic materials.
We report magnetotransport measurements on bulk samples of C3B and C3P, in temperatures down to 2 K and fields up to 9 T. We find both materials are semiconducting. The resistivity exhibits a non-Arrhenius temperature dependence over a wide range. At low temperatures, the dependence of resistivity on field is nearly linear and does not saturate in fields up to 9 T. Our findings are discussed in the context of current theoretical models of these novel materials.