Monday, June 24, 2013

1306.5190 (A. N. Rudenko et al.)

Exchange interactions and frustrated magnetism in single-side
hydrogenated and fluorinated graphene

A. N. Rudenko, F. J. Keil, M. I. Katsnelson, A. I. Lichtenstein
Magnetism in single-side hydrogenated (C$_2$H) and fluorinated (C$_2$F) graphene is analyzed in terms of the Heisenberg model with parameters determined from first principles. We predict a frustrated ground state for both systems, which means the instability of collinear spin structures and sheds light on the absence of a conventional magnetic ordering in defective graphene demonstrated in recent experiments. Moreover, our findings suggest a highly correlated magnetic behavior at low temperatures offering the possibility of a spin-liquid state.
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