Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-08-22
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 5 figures; accepted in Phys. Rev. B as regular article
Scientific paper
We report on a systematic temperature dependent X-band electron paramagnetic resonance (EPR) study of nano-sized graphite particles prepared by ball-milling. In as-prepared samples a very intense and sharp EPR resonance at $g=2.0035$ has been measured. The EPR linewidth shows a Korringa-like linear temperature dependence arising due to the coexistence and strong exchange coupling of itinerant and localized edge states. With a prolonged aging in inert atmosphere changes in the EPR signal suggest gradual structural reconstruction where the localized edge-states dominate the EPR signal. In this case the EPR spin susceptibility shows a maximum at $\approx 23\, {\rm K}$ indicating the development of antiferromagnetic correlations as expected for the graphene lattice with a bipartite symmetry.
Arčon Denis
Cevc Pavel
Kausteklis Jonas
Mazzani Marcello
Nasi Lucia
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