Bilayer exchange coupling and Neel temperature of YBa2Cu3O6.2

被引：1

作者：

Govind ^{[1
]}

Pratap, A ^{[1
]}

Ajay ^{[1
]}

Tripathi, RS ^{[1
]}

机构：

[1] Govind Ballabh Pant Univ Agr & Technol, Dept Phys, Pantnagar 263145, Uttar Pradesh, India

来源：

PRAMANA-JOURNAL OF PHYSICS | 2000年 / 54卷 / 03期

关键词：

bilayer antiferromagnets; high-T-c superconductors; Neel temperature;

D O I：

10.1007/s12043-000-0134-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The present paper attempts to study the Neel temperature of bilayer antiferromagnetic cuprate YBa2Cu3O6.2 within anisotropic Heisenberg model. The double time Green's function formalism within random phase approximation (RPA) has been used to obtain various correlation functions. The magnetization and the Neel temperature (T-N) are evaluated. It is observed that the ratio of intrabilayer to inplane exchange coupling (r = J(perpendicular to)/J(parallel to)) plays an important role in the magnetic dynamics of bilayer systems. The recent experimental data of bilayer system YBa2Cu3O6.2 have been used to estimate the ratio r from the expression for Neel temperature. The estimated values of spin gap and the ratio of hopping matrix elements t(perpendicular to)/t(parallel to) are found to be in fairly good agreement with the existing experimental results.

引用

页码：423 / 429

页数：7

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