MANY-BODY EFFECTS IN THE NORMAL-STATE POLARON SYSTEM

被引：53

作者：

ALEXANDROV, AS ^{[1
]}

机构：

[1] MOSCOW ENGN PHYS INST,MOSCOW,USSR

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.46.2838

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dielectric response function of small polarons (SP's) is studied. The Debye radius is small, which reduces a short-range Coulomb repulsion to the magnitude of the order of the small-polaron (SP) bandwidth. Polaron-polaron attraction is enhanced by screening. A critical temperature of the bipolaron formation is found. The dielectric response becomes dynamic in a very low-frequency region. A multiphonon diagram technique is developed to obtain vibration excitations, that are a mixture of phonons with polaronic plasmons. A microscopic model of the anomalous extra modes, observed in neutron-scattering experiments in La2CuO4, is proposed.

引用

页码：2838 / 2844

页数：7

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