Abstract
We address the problem of resistivity saturation observed in materials such as the -15 compounds. To do so, we calculate the resistivity for the Hubbard-Holstein model in infinite spatial dimensions to second order in on-site repulsion and to first order in (dimensionless) electron-phonon coupling strength , where is the half bandwidth. We identify a unique mechanism to obtain two parallel quantum conducting channels: low-energy and band-edge high-energy quasi-particles. We identify the source of the hitherto unremarked high-energy quasiparticles as a positive slope in the frequency dependence of the real part of the electron self-energy. In the presence of phonons, the self-energy grows linearly with the temperature at high , causing the resistivity to saturate. As is increased, the saturation temperature is pushed to higher values, offering a mechanism by which electron correlations destroy saturation.
1 More- Received 28 June 2018
DOI:https://doi.org/10.1103/PhysRevLett.122.026602
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