Specific temperature dependence of pseudogap in YBa2Cu3O7δ nanolayers

A. L. Solovjov, L. V. Omelchenko, V. B. Stepanov, R. V. Vovk, H.-U. Habermeier, H. Lochmajer, P. Przysłupski, and K. Rogacki
Phys. Rev. B 94, 224505 – Published 9 December 2016

Abstract

The pseudogap (PG) derived from the analysis of the excess conductivity σ(T) in superlattices and double-layer films of YBa2Cu3O7δ-PrBa2Cu3O7δ (YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The σ(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-Tc superconductors (cuprates) below the representative temperature T*Tc resulting in the PG opening. Within the model, the temperature dependencies of the PG, Δ*(T), for the samples with different number of the PrBCO layers (NPr) were analyzed in the whole temperature range from T* down to Tc. Near Tc,σ(T) 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 Tc. All sample parameters were found to change with increase of NPr, finally resulting in the appearance of the pronounced maximum of Δ*(T) at high temperatures. The result is most likely due to increasing influence of the intrinsic magnetism of PrBCO (μPr4μB) and suggests the possibility to search in that way the change of interplay between the superconductivity and magnetism in cuprates.

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  • Received 24 June 2016
  • Revised 15 October 2016

DOI:https://doi.org/10.1103/PhysRevB.94.224505

©2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. L. Solovjov1,2, L. V. Omelchenko1, V. B. Stepanov1, R. V. Vovk3, H.-U. Habermeier4,5, H. Lochmajer6, P. Przysłupski7, and K. Rogacki2,6,*

  • 1B. I. Verkin Institute for Low Temperature Physics and Engineering of National Academy of Science of Ukraine, 47 Nauki ave., 61103 Kharkov, Ukraine
  • 2International Laboratory of High Magnetic Fields and Low Temperatures, 95 Gajowicka Str., 53-421, Wroclaw, Poland
  • 3Physics Department, V. Karazin Kharkiv National University, Svobody Sq. 4, 61077 Kharkiv, Ukraine
  • 4Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 5Science Consulting International. Niersteinerstrasse 28, D 70499 Stuttgart, Germany
  • 6Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okolna 2, 50-422 Wroclaw, Poland
  • 7Institute of Physics, Polish Academy of Sciences, al. Lotnikow 32/46, 02-668 Warsaw, Poland

  • *k.rogacki@int.pan.wroc.pl

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Issue

Vol. 94, Iss. 22 — 1 December 2016

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