Abstract
We investigated the electrical conduction and dielectric relaxation of reduced Cr-doped SrTiO3−δ thin films. The electrical conduction behavior indicates the formation of small polarons in oxygen deficient Cr-doped SrTiO3−δ thin films. The associated dielectric relaxation further indicates nonadiabatic small polaron tunneling conduction. A strong electron-phonon interaction is identified based on the large polaron coupling constant, α≈28(α⪢4).
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