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Cu charge fluctuations and anomalous behaviour in the phonon spectrum of La{sub 2}CuO{sub 4}

Technical Report:

Abstract

The additional excitation observed in the phonon spectrum of La{sub 2}CuO{sub 4} is shown to arise from Cu charge fluctuations. A nonlinear breathing shell model is formulated for the coupling of these fluctuations with the lattice. The harmonic dynamics and exact nonlinear solutions are studied in a 2-D model of the CuO{sub 2} planes. A molecular dynamics simulation shows an additional peak of nonphononic character originated by the nonlinear lattice dynamics. (author). 20 refs, 3 figs.
Authors:
Dobry, A; Greco, A; Migoni, R; [1]  Stachiotti, M
  1. Instituto de Fisica Rosario, Rosario (Argentina)
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
IC-91/281
Reference Number:
SCA: 665100; PA: AIX-23:018344; SN: 92000661955
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COPPER OXIDES; LATTICE VIBRATIONS; ELECTRONIC STRUCTURE; FLUCTUATIONS; LANTHANUM OXIDES; NONLINEAR PROBLEMS; PHONONS; TWO-DIMENSIONAL CALCULATIONS; 665100; NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
OSTI ID:
10118600
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE92617446; TRN: XA9230483018344
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
8 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Dobry, A, Greco, A, Migoni, R, and Stachiotti, M. Cu charge fluctuations and anomalous behaviour in the phonon spectrum of La{sub 2}CuO{sub 4}. IAEA: N. p., 1991. Web.
Dobry, A, Greco, A, Migoni, R, & Stachiotti, M. Cu charge fluctuations and anomalous behaviour in the phonon spectrum of La{sub 2}CuO{sub 4}. IAEA.
Dobry, A, Greco, A, Migoni, R, and Stachiotti, M. 1991. "Cu charge fluctuations and anomalous behaviour in the phonon spectrum of La{sub 2}CuO{sub 4}." IAEA.
@misc{etde_10118600,
title = {Cu charge fluctuations and anomalous behaviour in the phonon spectrum of La{sub 2}CuO{sub 4}}
author = {Dobry, A, Greco, A, Migoni, R, and Stachiotti, M}
abstractNote = {The additional excitation observed in the phonon spectrum of La{sub 2}CuO{sub 4} is shown to arise from Cu charge fluctuations. A nonlinear breathing shell model is formulated for the coupling of these fluctuations with the lattice. The harmonic dynamics and exact nonlinear solutions are studied in a 2-D model of the CuO{sub 2} planes. A molecular dynamics simulation shows an additional peak of nonphononic character originated by the nonlinear lattice dynamics. (author). 20 refs, 3 figs.}
place = {IAEA}
year = {1991}
month = {Sep}
}