Andersen Group El.-Phon. QMC C60 Resistivity saturation

Fermion-boson systems

We have implemented a fermion-boson determinantal method (R. Blankenbecler, D.J. Scalapino, and R.L. Sugar, Phys. Rev. D 24, 2278 (1981)) and applied it to models of alkali-doped fullerenes and transition metal compounds. We calculate the current-current correlation function and, via a maximum entropy method, the optical conductivity, which gives the resistivity. The reasons for the exceptionally short mean-free path at high temperatures of the alkali-doped fullerides are studied Nature 405 , 1027 (2000). We have furthermore studied resistivity saturation of transition metal compounds and obtained a quantum mechanical derivation of the Ioffe-Regel condition Phys. Rev. Lett. 87, 266601 (2001), Phys. Rev. B 66 , 205105 (2002). This makes it possible to study saturation as well as lack of saturation for different classes of materials.

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