This article is cited in 5 papers

Modification of the superconducting order parameter $\Delta(k)$ by long-range interactions

V. V. Val'kov^abc, D. M. Dzebisashvili<sup>db

a</sup> Krasnoyarsk State Technical University
^b L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^c Krasnoyarsk State University, Krasnoyarsk
^d Siberian Federal University, Krasnoyarsk

Abstract: It is demonstrated that the inclusion of long-range intersite interactions qualitatively modifies the dependence of a superconducting gap on quasimomentum for both $s$-and $d$-symmetry types. In particular, the order parameter of a superconducting phase with $d_{x^2-y^2}$ the symmetry type depends on two amplitudes and has the form $\Delta(k)= \Delta_1 (\cos{k_x}-\cos{k_y})+\Delta_2 (\cos{2k_x}-\cos{2k_y})$. In this case, the theoretical dependence of the critical temperature on the degree of doping agrees with the experimental dependence.

PACS: 71.27.+a, 74.90.+n, 75.10.Lp

Received: 09.12.2002
Revised: 21.02.2003

 English version: Journal of Experimental and Theoretical Physics Letters, 2003, 77:7, 381–384

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