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Towards a microscopic gauge-invariant theory of the c-axis electrodynamics of multilayer high-Tc compounds

Název česky Na cestě k mikroskopické kalibračně-invariantní teorii elektrodynamiky vrstevnatých vysokoteplotních supravodičů
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CHALOUPKA Jiří MAREK Jiří MUNZAR Dominik

Rok publikování 2006
Druh Článek ve sborníku
Konference M2S-HTSC VIII
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Fyzika pevných látek a magnetismus
Klíčová slova gauge-invariance;high-Tc compounds;optical response;bilayer split bands
Popis The nature of the electronic coupling between the neighbouring copper-oxygen planes in bilayer high-Tc cuprate superconductors is closely related to that of the underlying ground state. For this reason, it is of fundamental interest. Photoemission experiments on bilayer Bi-2212 reveal two well defined bands, corresponding to even- and odd- symmetry electronic states of the two planes. Measured c-axis IR spectra of underdoped bilayer materials, however, rather appear to be consistent with the model, where the stack of the planes is represented by a superlattice of Josephson junctions. We report on our attempts to resolve the controversy by computing the IR response considering the bilayer-split bands, such as observed by photoemission, and comparing the results with optical data. The simplest conceivable approach has been improved by including selfenergy terms, such as used in our study of the in-plane response, and vertex-corrections required for the theory to be gauge invariant.
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