Electronically induced anomaly in LO phonon dispersion of high - Tc superconductors

Barišić, Slaven and Mrkonjić, Ivana and Kupčić, Ivan (2001) Electronically induced anomaly in LO phonon dispersion of high - Tc superconductors. Fizika A, 10 (4). pp. 169-176. ISSN 1330-0008

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Abstract

Strong, electronically-induced anomaly in the spectrum of the longitudinal optical (LO) phonons propagating along the main axes of the CuO_2 plane is tentatively attributed to the oxygen-oxygen charge transfer between two in-plane oxygen atoms. It is argued that this charge transfer can be large and that it is strongly coupled to the LO dimerization of the oxygens. The corresponding negative contribution to the free energy is quartic in the LO phonon amplitude, indicating the instability via the first-order phase transition, with a concomitant domain structure.

Item Type: Article
Keywords: superconductivity, high-Tc cuprates, LO phonons, oxygen-oxygen charge susceptibility, first-order phase transitions
Date: 2001
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: Hrvatsko fizikalno društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 Apr 2014 16:28
Last Modified: 15 Apr 2014 16:28
URI: http://digre.pmf.unizg.hr/id/eprint/842

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