Theoretical investigation of the impact of intra‐ and inter‐layer coupling of high T_C superconductor Nd_2‐xCe_xCuO₄

Abstract

The aim of the current study is to investigate the impact of layer coupling on the characteristics of high TC superconductor Nd2‐xCexCuO4 (NCCO). In this study, the intra‐ and inter‐layer couplings are taken into consideration. By applying the double time Green's function (GF) technique and formulating a model Hamiltonian, the transition temperature (TC) of superconductor Nd2‐xCexCuO4 is computed quantitatively by considering the intra‐ and inter‐layer interactions as independent variables. By increasing the layer interactions, the increase in TC is observed. Furthermore, TC is calculated by taking into consideration different number of interlayer interactions as independent variables which subsequently resulted in the enhancement of TC. Besides, TC has been computed as a function of electron doping as a result of which a dome shaped figure has been perceived in the temperature versus doping phase diagram. The superconducting order parameter (Δ) has been also reckoned as a function of temperature and is observed to gradually decrease as temperature increases and eventually vanishes at TC. A slight increment in TC is observed as the doping values of charge carriers increase. Our findings are discussed in connection with the experimental studies of superconductivity (SC) in Nd2CuO4 based layered compounds.