(HBCU) Doped Graphene and Graphite as a Potential High Temperature Superconductor
Final rept. 30 Apr 2010-30 Apr 2013
FLORIDA INTERNATIONAL UNIV MIAMI
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We have observed possible superconductivity using standard resistance vs. temperature techniques in phosphorous ion implanted Highly Oriented Pyrolytic Graphite. The onset appeared to be above 100 K and quenching by an applied magnetic field was observed. Four boron implanted samples showed no signs of becoming superconductive whereas all four initial and eight subsequent samples that were implanted with phosphorous showed at least some sign of the existence of small amounts of the possibly superconducting phases. The observed onset temperature is dependent on both the number of electron donors present and the amount of damage done to the graphene sub-layers in the Highly Oriented Pyrolytic Graphite samples. Measurements using graphene multilayers exfoliated from doped Highly Oriented Pyrolytic Graphite confirm that the effect is seen with donor dopants and not with neutral or acceptor dopants. Additionally, steps are clearly observable at temperatures that are multiples of 60K. These often extend to near room temperature.
- Electricity and Magnetism