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

The pseudogap (PG) derived from the analysis of the excess conductivity \(\sigma'(T)\) in superlattices and double-layer films of \(YBa_2Cu_3O_{7-\delta}\)-\(PrBa_2Cu_3O_{7-\delta}\)(YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The \(\sigma'(T)\) analysi...

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Bibliographic Details
Published in:arXiv.org 2018-04
Main Authors: Solovjov, A L, Omelchenko, L V, Stepanov, V B, Vovk, R V, H -U Habermeier, Lochmajer, H, Przysłupski, P, Rogacki, K
Format: Article
Language:English
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Summary:The pseudogap (PG) derived from the analysis of the excess conductivity \(\sigma'(T)\) in superlattices and double-layer films of \(YBa_2Cu_3O_{7-\delta}\)-\(PrBa_2Cu_3O_{7-\delta}\)(YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The \(\sigma'(T)\) 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 \(T^*\gg T_c\) resulting in the PG opening. Within the model, the temperature dependencies of the PG, \(\Delta^*(T)\), for the samples with different number of the PrBCO layers (\(N_{Pr}\)) were analyzed in the whole temperature range from \(T^*\) 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 \(\Delta^*(T)\) 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1804.06119