Testing the Elliott-Yafet spin-relaxation mechanism in KC8; a model system of biased graphene
Gábor Fábián, Balázs Dóra, Ágnes Antal, Lénárd Szolnoki, László Korecz, Antal Rockenbauer, Norbert M. Nemes, László Forró, Ferenc Simon
Abstract
Temperature dependent electron spin resonance (ESR) measurements are reported on stage 1 potassium doped graphite, a model system of biased graphene. The ESR linewidth is nearly isotropic and although the g-factor has a sizeable anisotropy, its majority is shown to arise due to macroscopic magnetization. Albeit the homogeneous ESR linewidth shows an unusual, non-linear temperature dependence, it appears to be proportional to the resistivity which is a quadratic function of the temperature. These observations suggests the validity of the Elliott-Yafet relaxation mechanism in KC8 and allows to place KC8 on the empirical Beuneu-Monod plot among ordinary elemental metals.