Doping patterns in N-type high temperature superconductors PLCCO and NCCO

Abstract

It has been demonstrated that the correlation between the doping distance and the critical transition temperature T c for P-type HTSCs also applies to double doped N-type HTSCs. It is suggested that electron doped HTSCs also form superconducting current channels lying parallel in the CuO 2 plane.

Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor Pr$_{0.87}$LaCe$_{0.13}$CuO$_4$

“…A significant drop in M (T ) has been observed at ∼ 23 K (see the dashed line) for both crystal directions which is defined as the onset of the superconducting transition temperature, T c of the sample. Simi- lar compounds with a Ce content of 0.13 28 and 0.12 14,32 , have reported transition temperatures in the range 22-24 K, in good agreement with the present work. Figures 2(a) and 2(b) show selected isothermal M (H) hysteresis curves for H c-axis and H ab-planes respectively.…”

Doping structure of the high temperature superconductor

“…The double doping concept has already been introduced by the authors [4][5][6], and we will use the same nomenclature for this compound. The oxygen ) and x 3 represents positions with unit cells containing both.…”

“…In this paper we will analyze the crystal structure of the double-doped La 2− Ca 1+ Cu 2 O 6+ material and tie it to the correlation shown in Eq. (1) between the doping structure value (2x) 2 and T c as detailed in prior publications [3][4][5][6].…”

Theoretical investigation of the impact of intra‐ and inter‐layer coupling of high TC superconductor Nd2‐xCexCuO4

“…The first group which is denoted by Ln 2‐x Ce x CuO 4 (with Ln = Pr, Nd, Sm, Eu, and Gd) followed by a subsequent annealing after which SC was discovered in 1989 and the second group denoted by Sr 1‐x Ln x CuO 2 (with Ln = La, Nd, Pr, Sm) was proven to be a superconductor in 1991. [ 7–11 ] Unlike to the other cuprate superconductors, the replacement of La 3+ by Ce 4+ in the former compound is well known to inject the mobile electrons instead of holes into the CuO 2 layers. [ 12 ] Hence, the CuO 2 plane becomes the layer in which the relevant physics takes place since the mobile charge carriers in the doped system reside primarily within the CuO 2 planes.…”

“…As it is clear from the outset, estimation of the layer coupling impact on T C is very important technique to study superconductors. [ 10 ] Furthermore, it has been recommended that, impurity doping could activate charges to be transferred between the layers. Even though, there are a lot of experimental explanations which evidently show that, this purely electronic picture is not complete and hence interlayer coupling effect by including electron doping has been taken into account in order to observe its impact on T C and $${{\Delta}}\ $$by considering the intra‐ and inter‐layer pairing interactions.…”