Polarons in axial transport in single-layer high-Tc superconductors

• Authors: Alexander Andreev , Stefka Tsintsarska , Maria Dimitrova-Ivanovich , Ivaylo Polyanski , Mladen Georgiev , Alexander Gochev
• Languages of publication: EN

Abstracts

EN

The temperatureT dependencies ρ(T) of normal state electric resistivitiesρ
c (axial) andρ
ab (in plane) of single-layer high-T
c superconductors show common trends: AsT is raised, the resistivity first drops steeply before it starts rising αT above an apparent semiconductor-to-metal crossoverT
cross. To analyze ρ(T) we plottT/ρ againstT at various dopingsx for bothρ
c andρ
ab.T/ρ is inversely proportional to the traversal time across a potential barrier as an ionic particle drifts in an electric field. We findT/ρ in good agreement with theT dependence of the quantum rate of migrating particles: AsT is raised, a zero-point rate at the lowestT is extended to a nearly flat plateau before a thermally activated branch sets in. We also find evidence for the admixture of 1- & 2-phonon absorptions below the Arrhenius range. These features shape the semiconductor-like branch below Tcross. AboveT
cross a metallic-like branch sets in, its αT character deriving from the field coupling of the migrating particle. Our analysis suggests that metal physics may not suffice if ionic features play a role in transport. We attribute our conclusions to the drift of strong-coupling polarons along Cu−O bonds. These “bond polarons” originate from carrier scattering by double-well potentials associated with the bonds. A bond polaron dissociates to a free hole as it passes onto a neighboring O-O link.

Keywords

EN

High temperature superconductivity; Axial transport; Polarons; Vibronic interactions; 71.38.-k; 71.38.Ht; 71.38.Mx; 74.20.Mn

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2004
• Volume: 2
• Issue: 2
• Pages: 329-356

Dates

published

1 - 6 - 2004

online

1 - 6 - 2004

Contributors

author

Alexander Andreev

author

Stefka Tsintsarska

• Central Laboratory for Photoprocesses, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

author

Maria Dimitrova-Ivanovich

• Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784, Sofia, Bulgaria

author

Ivaylo Polyanski

• Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784, Sofia, Bulgaria

author

Mladen Georgiev

• Fulbright Research Fellow, Department of Chemistry & Biochemistry, University of California San Diego, 9500 Gilman Dr., 92093-0340, La Jolla, CA

author

Alexander Gochev

• PGA Solutions, 919 Master Dr., 43119, Galloway, OH

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Identifiers

DOI

10.2478/BF02475635