PHONONS AND SPECIFIC-HEAT IN HIGH-TC TL1(2)BA2CAN-1CUNO2N+3(4) SUPERCONDUCTORS

被引：6

作者：

AGRAWAL, BK

NEGI, JS

AGRAWAL, S

YADAV, PS

机构：

[1] Department of Physics, University of Allahabad, Allahabad

来源：

PHYSICA C | 1992年 / 192卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90766-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A simple Born model involving only a few adjustable parameters explains very well for the first time the experimental data available for the Tl-based Tl1(2)Ba2Can-1CuO2n+3(4), n = 1 to 3 high-T(c) oxide superconductors. In particular, for the Tl2Ba2CaCu2O8 system the calculated phonon density of states is in very good agreement with the neutron data. There are small discrepancies in the low frequency region where the calculated phonons appear, comparatively towards the low frequency side. The phonon bands show highly two-dimensional behaviour. Planar dispersions are significant only for the Cu-O2 layers. The lattice specific heat in the low temperature region shows a non-Debye behaviour i.e., a variation different from a T3 one. This puts into question the reliability of the magnitude and the temperature dependence of the non-lattice contributions determined in an analysis of the observed total specific heat after assuming a T3-dependent lattice contribution.

引用

页码：237 / 246

页数：10

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