4.7 Article

Superconductivity and appearance of negative magnetocaloric effect in Ba1-xKxBiO3 perovskites, doped by Y, La and Pr

Journal

ACTA MATERIALIA
Volume 222, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.117437

Keywords

Copper-free oxide high-T-c superconductors; Magnetic properties; Spectroscopic measurements; Microstructure; Density functional theory

Funding

  1. Faculty of Mathematics and Natural Sciences of the Cardinal Stefan Wyszyski University (CSWU) in Poland
  2. TU Wien (TUW) in Austria
  3. Polish National Agency for Academic Exchange under the 'Polish Returns 2019 'program [PPN/PPO/2019/1/00014]
  4. Faculty of Chemistry, Warsaw University of Technology in Poland

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This paper reports comprehensive studies of the electronic properties of Ba(1-x)K(x)Bi(1-y)REyO(3) bismuth perovskites (REBKBO, RE = Y , La or Pr), showing that these materials can have their electronic properties tailored by doping, with significant differences observed in the spectrum of PrBKBO due to the magnetic contribution of Pr3+ multiplet. A negative magnetocaloric effect was observed below 30 K, highlighting the peculiar properties of these materials.
Recently, substantial attention is given to the bismuth-based perovskites for variety of electronic applications. The perovskites are used for quantum dots displays (QLED), photovoltaic systems and superconducting (HTS) devices. In this paper comprehensive studies of Ba(1-x)K(x)Bi(1-y)REyO(3) bismuth perovskites (REBKBO, RE = Y , La or Pr) are reported. Apart from structural anomalous behavior at low temperatures, the electronic properties of the REBKBO can be easily tailored by doping. For instance, critical current densities differ by 3 orders of magnitude from 0.07 kA/cm(2) (LaBKBO) to 65 kA/cm(2) (BKBO). To explain the above behavior, microstructural, magnetic, calorimetric, spectroscopic (FT-IR) studies and ab-initio electronic structure calculations were carried out. The FT-IR shows that the biggest difference in the spectrum compared to the undoped sample was recorded for PrBKBO, due to magnetic contribution of the Pr3+ multiplet. Electronic structure calculations revealed that the BKBO compound shows the highest DOS(E-F) compared to the other samples, however, the electronic structure of PrBKBO is very different. The negative magnetocaloric effect observed below 30 K is a highlight of the peculiar properties of that sample. These findings extend possible usage of bismuth-based perovskites towards new applications. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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