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Polaronic Signatures in Mid-Infrared Spectra: Prediction for LaMnO3 and CaMnO3
Yiing-Rei Chen, Vasili Perebeinos, Philip B. Allen
Hole-doped LaMnO3 and electron-doped CaMnO3 form self-trapped electronic states. The spectra of these states have been calculated using a two orbital (Mn eg Jahn-Teller) model, fro…
Metals with Small Electron Mean-Free Path: Saturation versus Escalation of Resistivity
Philip B. Allen
Resistivity of metals is commonly observed either to 'escalate' beyond the Ioffe-Regel limit (mean free path l equal to lattice constant a) or to 'saturate' at this point. It is ar…
Self-Trapped Exciton Defects in a Charge Density Wave: Electronic Excitations of BaBiO3
Philip B. Allen, Ilka B. Bischofs
In the previous paper, it was shown that holes doped into BaBiO3 self-trap as small polarons and bipolarons. These point defects are energetically favorable partly because they und…
Polaron and Bipolaron Defects in a Charge Density Wave: a Model for Lightly Doped BaBiO3
Ilka B. Bischofs, Vladimir N. Kostur, Philip B. Allen
BaBiO3 is a prototype ``charge ordering system'' forming interpenetrating sublattices with nominal valence Bi(3+) and Bi(5+). It can also be regarded as a three-dimensional version…
Optical studies of charge dynamics in c-axis oriented superconducting MgB2 films
J. J. Tu, G. L. Carr, V. Perebeinos +7
Temperature dependent optical conductivities and DC resistivity of c-axis oriented superconducting (Tc = 39.6 K) MgB2 films (~ 450 nm) have been measured. The normal state ab-plane…
Spin versus Lattice Polaron: Prediction for Electron-Doped CaMnO3
Yiing-Rei Chen, Philip B. Allen
CaMnO3 is a simple bi-partite antiferromagnet(AF) which can be continuously electron-doped up to LaMnO3. Electrons enter the doubly degenerate E_g subshell with spins aligned to th…