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Local Diamagnetic Susceptibility of Quasi-Two-Dimensional Graphite

A sample of quasi-two-dimensional graphite (QTDG) whose magnetic properties are described within the Dirac fermion model is investigated by the nuclear magnetic resonance (NMR) and scanning tunneling microscopy (STM) techniques. The broad spectrum of the sample points to a large dispersion of crystallite sizes in this system, which is also confirmed by STM data. It is established that the local diamagnetic susceptibility may substantially exceed the average value over the sample and reaches an abnormally high value of $-1.3\times 10^{-4}$ emu/g at $T = 4.2$ K, which is greater than the corresponding value of highly oriented graphite by a factor of four.