Volume 34, Number 5, May II 1996
|Page(s)||367 - 372|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Multimode electron-phonon coupling in the two-dimensional t-J–Holstein model
Laboratoire de Physique Quantique, Université Paul Sabatier,
31062 Toulouse, France
2 Department of Physics, University of California Santa Barbara, CA 93106, USA
3 Institute for Physics, University of Wurzburg, D-8700 Wurzburg, Germany
Accepted: 21 March 1996
Polaronic effects are investigated in the two-dimensional model (describing Cu spins and holes of the planes in high-Tc cuprates) in the presence of in-plane dynamic oxygen breathing modes. We focus on the effect of dynamic multi-phonon modes. Spin and charge structure factors are computed. We found evidence for self-localization of the holes and increased short-range antiferromagnetic spin-spin correlations between the remaining spins. This effect persists when all the in-plane oxygen vibration degrees of freedom are taken into account. This suggests that dynamic phonons could play a key role in stabilizing inhomogeneous stripe phases or domain wall structures.
PACS: 71.27.+a – Strongly correlated electron systems / 71.38.+i – Polarons and electron-phonon interactions / 74.20.Mn – Microscopic theory of high- superconductivity; insulator-superconductor transitions
© EDP Sciences, 1996
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