c-axis transport in highly anisotropic metals: role of small polarons

Andrew Ho, Andrew Schofield

Research output: Contribution to journalArticle

11 Citations (Scopus)


We show in a simple model of interlayer hopping of single electrons that transport along the weakly coupled c-axis of quasi-two-dimensional metals does not always probe only the in-plane electron properties. In our model where there is a strong coupling between electrons and a bosonic mode that propagates in the c direction only, we find a broad maximum in the c-axis resistivity at a temperature near the characteristic energy of the bosonic mode, while no corresponding feature appears in the ab plane transport. At temperatures far from this bosonic energy scale, the c-axis resistivity does track the in-plane electron scattering rate. We demonstrate a reasonable fit of our theory to the apparent metallic to nonmetallic crossover in the c-axis resistivity of the layered ruthenate Sr2RuO4.
Original languageEnglish
Article number045101
JournalPhysical Review B
Issue number4
Early online date1 Jan 2005
Publication statusPublished - 1 Jan 2005


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