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|Type:||Artigo de periódico|
|Title:||Searching For The Fractional Quantum Hall Effect In Graphite|
Da Silva R.R.
Medina Pantoja J.C.
|Abstract:||Measurements of basal plane longitudinal ρb(B) and Hall ρH(B) resistivities were performed on highly oriented pyrolytic graphite samples in a pulsed magnetic field up to B=50T applied perpendicular to graphene planes, and temperatures 1.5K≤T≤4.2K. At B>30T and for all studied samples, we observed a sign change in ρH(B) from electron- to holelike. For our best quality sample, the measurements revealed the enhancement in ρb(B) for B>34T (T=1.8K), presumably associated with the field-driven charge density wave or Wigner crystallization transition. In addition, well-defined plateaus in ρH(B) were detected in the ultraquantum limit revealing possible signatures of the fractional quantum Hall effect in graphite. © 2009 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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