Experimental Evidence for Two-Dimensional Magnetic Order in Proton Bombarded Graphite

Details Experimental Evidence for Two-Dimensional Magnetic Order in Proton Bombarded Graphite Experimental Evidence for Two-Dimensional Magnetic Order in Proton Bombarded Graphite

2007-06-16

arxiv.org/abs/0706.2442v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.161403

We have prepared magnetic graphite samples bombarded by protons at low temperatures and low fluences to attenuate the large thermal annealing produced during irradiation. An overall optimization of sample handling allowed us to find Curie temperatures $ T_c \gtrsim 350$ K at the used fluences. The magnetization versus temperature shows unequivocally a linear dependence, which can be interpreted as due to excitations of spin waves in a two dimensional Heisenberg model with a weak uniaxial anisotropy.

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