Low Temperature Physics: 36, 716 (2010); https://doi.org/10.1063/1.3490856 (6 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 8-9 (August 2010), p. 902-908    ( to contents , go back )

A high-energy "kink" in the quasi-particle spectrum as an evidence of the important role of chargedensity fluctuations in the mechanism of hightemperature superconductivity of cuprates

E.A. Pashitskii and V.I. Pentegov

Institute of Physics of the National Academy of Sciences of Ukraine, 46 Nauki Ave., Kyiv 03028, Ukraine
E-mail: pashitsk@iop.kiev.ua
pos Анотація:

Received March 17, 2010

Abstract

It is suggested that the kink-like feature observed in the ARPES measurements of quasiparticle band spectra of cuprate metal-oxides at high energies ε ≥ 0.3 eV may be due to collective charge-density fluctuations with quasi-acoustic dispersion (acoustic plasmons), which are conditioned by both the layered crystal structure of cuprates and the strong anisotropy of the electronic spectrum in the plane of two-dimensional CuO2 layers. Such charge-density fluctuations are supposed to play a significant role in the mechanism of high-temperature superconductivity, increasing substantially the critical temperature of superconducting transition in cuprate metal-oxides.

PACS: 71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons;
PACS: 74.20.–z Theories and models of superconducting state;
PACS: 74.72.–h Cuprate superconductors.

Key words: kink, acoustic plasmon spectrum, screened Coulomb interaction, layered crystals, cuprates, mechanism of high-temperature superconductivity.

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