NMR of localized magnetic states in graphene

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The NMR relaxation rate is studied on the magnetic states of an impurity in bilayer graphene within a tight-binding scenario. The dependencies of the relaxation rate on temperature, interlayer interaction and also the chemical potential have been considered. Although for low temperatures we observe the usual Korringa relation, a characteristic of the conventional fermions, the rate increases with the increase in temperature and tends to saturate for high temperatures. For small interlayer interactions ( t⊥ ) the system can be either magnetic or non-magnetic. However for higher t⊥ we observe the existence of only a pure magnetic state. In graphene this transition is also observed with two cusps related to the magnetic to non-magnetic transition, which modifies to a single hump for higher t⊥ , where the system is purely magnetic for any value of chemical potential. © 2012 Elsevier B.V. All rights reserved.




Frota, H. O., & Ghosh, A. (2012). NMR of localized magnetic states in graphene. Physica B: Condensed Matter, 407(7), 1170–1174. https://doi.org/10.1016/j.physb.2012.01.112

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