An equation of state for high-temperature superconductor

被引:0
作者
Pandey R.K. [1 ]
Gupta B.R.K. [1 ]
机构
[1] Department of Physics, G. B. Pant University of Agriculture and Technology
来源
Journal of Superconductivity | 1997年 / 10卷 / 6期
关键词
Bulk modulus; Cohesive energy; Equation of state;
D O I
10.1007/BF02471930
中图分类号
学科分类号
摘要
In the present paper the expression of cohesive energy and the bulk modulus as a function of volume are formulated for high-Tc copper oxide superconductors. The model employed consists of long-range electrostatic Coulomb interaction and short-range overlap repulsion. The short-range overlap potential is considered in the Born-Landé inverse power form. The model parameters of the Born-Landé model are calculated from the equilibrium condition and data of bulk modulus at room temperature. The computed values of pressure derivatives of bulk modulus at P = 0 and the values of bulk modulus are found to be in very close agreement with experimental values for high-Tc copper oxide and their nonsuperconducting parent compounds. It is also found that the quantity ΔU/U(V0) of these compounds increases with increasing hydrostistic pressure. © 1997 Plenum Publishing Corporation.
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页码:669 / 672
页数:3
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