Physics – Condensed Matter – Superconductivity
Scientific paper
2003-01-29
Physics
Condensed Matter
Superconductivity
9 pages, 6 figures. Submitted to Physical Review B
Scientific paper
10.1140/epjb/e2004-00218-6
With the superconducting cuprates in mind, a set of unitary transformations was used to decouple electrons and phonons in the strong-coupling limit. While phonons remain almost unrenormalised, electrons are transformed into itinerent singlet and triplet bipolarons and thermally excited polarons. The triplet/singlet exchange energy and the binding energy of the bipolarons are thought to account for the spin and charge pseudogaps in the cuprates, respectively. We calculated the Hall Lorenz number of the system to show that the Wiedemann-Franz law breaks down due to the interference of the polaron and bipolaron contributions to heat flow. The model provides a quantitative fit to magnetotransport data in the cuprates. Furthermore we are able to extract the phonon component of the thermal conductivity with the use of experimental data and the model. Our results further validate the use of a charged Bose gas model to describe normal and superconducting properties of unconventional superconductors.
Alexandrov Alexandre S.
Lee Kimyeong
Liang W. Y.
No associations
LandOfFree
Breakdown of the Wiedemann-Franz law in strongly-coupled electron-phonon system, application to the cuprates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Breakdown of the Wiedemann-Franz law in strongly-coupled electron-phonon system, application to the cuprates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Breakdown of the Wiedemann-Franz law in strongly-coupled electron-phonon system, application to the cuprates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-679392