Observation of conduction electron spin resonance in boron doped diamond

Abstract

We observe the electron spin resonance of conduction electrons in boron doped\n(6400 ppm) superconducting diamond (Tc =3.8 K). We clearly identify the\nbenchmarks of conduction electron spin resonance (CESR): the nearly temperature\nindependent ESR signal intensity and its magnitude which is in good agreement\nwith that expected from the density of states through the Pauli\nspin-susceptibility. The temperature dependent CESR linewidth weakly increases\nwith increasing temperature which can be understood in the framework of the\nElliott-Yafet theory of spin-relaxation. An anomalous and yet unexplained\nrelation is observed between the g-factor, CESR linewidth, and the resistivity\nusing the empirical Elliott-Yafet relation.\n