Abstract
The pseudogap (PG) derived from the analysis of the excess conductivity in superlattices and double-layer films of (YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The analysis has been performed within the local-pair (LP) model based on the assumption of the paired fermion (LPs) formation in the cuprate high- superconductors (cuprates) below the representative temperature resulting in the PG opening. Within the model, the temperature dependencies of the PG, , for the samples with different number of the PrBCO layers () were analyzed in the whole temperature range from down to . Near was found to be perfectly described by the Aslamazov–Larkin (AL) and Hikami–Larkin (HL) [Maki–Thompson (MT) term] fluctuation theories, suggesting the presence of superconducting fluctuations in a relatively large (up to 15 K) temperature range above . All sample parameters were found to change with increase of , finally resulting in the appearance of the pronounced maximum of at high temperatures. The result is most likely due to increasing influence of the intrinsic magnetism of PrBCO () and suggests the possibility to search in that way the change of interplay between the superconductivity and magnetism in cuprates.
5 More- Received 24 June 2016
- Revised 15 October 2016
DOI:https://doi.org/10.1103/PhysRevB.94.224505
©2016 American Physical Society