Specific temperature dependence of pseudogap in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ nanolayers

Abstract

The pseudogap (PG) derived from the analysis of the excess conductivity ${\sigma }^{\prime }(T)$ in superlattices and double-layer films of $YB{a}_{2}C{u}_3{O}_{7-\delta }$-$PrB{a}_{2}C{u}_3{O}_{7-\delta }$(YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The ${\sigma }^{\prime }(T)$ analysis has been performed within the local-pair (LP) model based on the assumption of the paired fermion (LPs) formation in the cuprate high-$T_c$ superconductors (cuprates) below the representative temperature $T^{\ast }\gg T_c$ resulting in the PG opening. Within the model, the temperature dependencies of the PG, ${\Delta }^{\ast }(T)$, for the samples with different number of the PrBCO layers ($N_{Pr}$) were analyzed in the whole temperature range from $T^{\ast }$ down to $T_c$. Near $T_c$, excess conductivity was found to be perfectly described by the Aslamasov-Larkin and Hikami-Larkin (Maki-Thompson term) fluctuation theories, suggesting the presence of superconducting fluctuations in a relatively large (up to 15 K) temperature range above $T_c$. All sample parameters were found to change with increase of $N_{Pr}$, finally resulting in the appearance of the pronounced maximum of ${\Delta }^{\ast }(T)$ at high temperatures. The result is most likely due to increasing influence of the intrinsic magnetism of PrBCO (${\mu }_{Pr}\approx 4{\mu }_B$) and suggests the possibility to search in that way the change of interplay between the superconductivity and magnetism in cuprates.

11 pages, 12 figures

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• Influence of strong electron irradiation on fluctuation conductivity and pseudogap in YBa${}_2$Cu${}_3$O${}_7$--$\delta$ single crystals
• Study of fluctuation conductivity in YBa${}_2$Cu${}_3$O${}_7$--$\delta$ films in strong magnetic fields
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• Effects of annealing on the fluctuation conductivity and pseudogap in slightly doped $HoB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystals
• Influence of annealing on the electrical resistance of YBCO single crystals
• Evolution of the pseudogap and excess conductivity of YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals in the course of long-term aging
• Annealing effects on the normal-state resistive properties of underdoped cuprates
• Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7-δsingle crystals