Electron spin resonance and microwave resistivity of single-wall carbon nanotubes

We compare the thermal variations of ESR, de, and microwave resistivity of unoriented bulk single wall carbon nanotube samples. We conclude that the ''metallic'' high-T behavior (d rho/dT > 0) is an intrinsic property of the bulk material, and that the system remains metallic even at low temperature where d rho/dT < 0. The spin susceptibility is also independent of T, and a long mean free path implies transport predominantly along the tube axes in bulk material.