Rudenko, A. N.A. N.RudenkoKeil, FrerichFrerichKeilKatsnelson, MikhailMikhailKatsnelsonLichtenstein, Alexander I.Alexander I.Lichtenstein2020-06-262020-06-262013-08-22Physical Review B - Condensed Matter and Materials Physics 88 (8): 081405 (2013)http://hdl.handle.net/11420/6478Magnetism in single-side hydrogenated (C₂H) and fluorinated (C₂F) 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.en1550-235X20138The American Physical SocietyPhysics - Mesoscopic Systems and Quantum Hall EffectPhysics - Mesoscopic Systems and Quantum Hall EffectPhysics - Materials SciencePhysics - Strongly Correlated ElectronsPhysikTechnikIngenieurwissenschaftenJournal Article10.1103/PhysRevB.88.0814051306.5190v1Journal Article