Abstract
In the present paper the expression of cohesive energy and the bulk modulus as a function of volume are formulated for high-T c 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 the pressure derivatives of the bulk modulus atP = 0 and the values of the bulk modulus are found to be in very close agreement with experimental values for high-T c copper oxide and their nonsuperconducting parent compounds. It is also found that the quantityAU/U( V 0 ) of these compounds increases with increasing hydrostatic pressure.
Similar content being viewed by others
References
J. G. Bednorz and K. A. Muller,Z. Phys. B 64, 189 (1986).
M. Cankurtaranet al., J. Phys. Contiens. Malier 1, 9067 (1989) ; M. Cankurtaranet al, Supercond. Sci. Teehnol.3, 1990 (1990); J. Eckeet al., Physica C 153-154, (1988); H. Ledbetteret al., Physica C 162-164, 207 (1990); M. Cankurtaranet ai, Phys. Rev. B 46, 1157 (1992).
C. Fanggoet al, Phys. Rev. B 43, 5526 (1991).
S. L. Yuanet al, Mod. Phys. Lett. B 3, 647 (1989).
S. S. Kushwaha and J. Shankar,Indian J. Pure Appl. Phys. 31, 733(1993).
M. Born and A. Landé,Verh. DPG 20, 210 (1918).
M. Fukuhara and H. A. McKinstry,Phys. Status Solidi B 157, 375 (1990).
R. Jayaprakashet al, Physica C 277, 109 (1994).
M. P. Tosi,Solid State Phvs. 16, 1 (1964).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Pandey, R.K., Gupta, B.R.K. An Equation of State for High-Temperature Superconductors. J Supercond 10, 495–498 (1997). https://doi.org/10.1007/BF02767684
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02767684