BIPOLARONS AND POLAREXCITONS IN CUO3-CHAINS

被引：1

作者：

DRECHSLER, SL ^{[1
]}

MALEK, J ^{[1
]}

ESCHRIG, H ^{[1
]}

机构：

[1] INST PHYS, PRAGUE, CZECHOSLOVAKIA

来源：

SYNTHETIC METALS | 1993年 / 57卷 / 2-3期

关键词：

D O I：

10.1016/0379-6779(93)90793-V

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nonlinear objects as bipolarons and polarexcitons are discussed for a quasi-onedimensional doping subsystem, possibly generic for all hole doped HTSC's. Based on LCAO-deformational studies of CuO3 chains in YBa2Cu3O7 and on known phonon frequencies, an effective two band Hamiltonian with two degrees of freedom, including both intra- and intersite electron-lattice interaction, has been proposed and examined in detail for various commensurate band filling ratios (v = 1/2, 1/3, 1/4, and 1/5 for the antibonding chain band). Well localized stable bipolarons with negative formation energies and low energy biexcitons have been found. Consequences for a microscopic scenario of a boson-fermion (s-channel) approach to HTSC proposed in ref. [1] and/or an excitonic enhancement of a standard t-channel as well as available experimental data are briefly discussed.

引用

页码：4626 / 4631

页数：6

共 16 条

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[13]

ESCHRIG H, IN PRESS

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