Pauli paramagnetism in a fermi glass

A broad Lorentzian ESR line in H-doped CaV2O6crystals has been observed and assigned to itinerant electrons in dx2-y2 orbitals. The spin susceptibility and the ESR linewidth vary weakly between 20 and 300 K, whereas the conductivity varies strongly, consistent with Mott's exp-(T0T)14 variable-range hopping law for random systems. Our observations demonstrate the existence of Fermi statistics in this system of protons and d electrons which may be more clustered than purely random. © 1981 The American Physical Society.