THE ORDERING OF POLARONS IN THE HOLSTEIN-T-J MODEL - AN APPLICATION TO LA2-XSRXNIO4+Y

被引：18

作者：

RODER, H ^{[1
]}

FEHSKE, H ^{[1
]}

SILVER, RN ^{[1
]}

机构：

[1] LOS ALAMOS NATL LAB,MSB262,LOS ALAMOS,NM 87545

来源：

EUROPHYSICS LETTERS | 1994年 / 28卷 / 04期

关键词：

D O I：

10.1209/0295-5075/28/4/007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The recently observed ordering of polarons in La2-xSrxNiO4+y is investigated in terms of a simple one-band model of strongly correlated electrons at quarter filling. The lattice distorsions are described by an in-plane breathing mode which is treated in the adiabatic limit. We use exact diagonalization techniques on small lattices to obtain the ground-state configuration and the excitation spectrum of the Holstein-t-J model. For large enough electron-phonon coupling a state resembling the observed ordering of polarons appears as the ground state of the Holstein-t-J model. We discuss the dependence of the charge and magnetic structure factors on doping away from quarter filling. Within the limits of a finite-lattice calculation our results agree qualitatively with the experiment.

引用

页码：257 / 262

页数：6

共 10 条

[1] SPIN BAGS, POLARONS, AND IMPURITY POTENTIALS IN LA2-XSRXCUO4 FROM 1ST PRINCIPLES [J].