Clamping effect on temperature-induced valence transition in epitaxial EuPd2Si2 thin films grown on MgO(001)

Sebastian Kölsch, Alfons Schuck, Michael Huth, Olena Fedchenko, Dmitry Vasilyev, Sergeij Chernov, Olena Tkach, Hans-Joachim Elmers, Gerd Schönhense, Christoph Schlüter, Thiago R. F. Peixoto, Andrii Gloskowski, and Cornelius Krellner
Phys. Rev. Materials 6, 115003 – Published 10 November 2022

Abstract

Bulk EuPd2Si2 show a temperature-driven valence transition of europium from +2 above 200 K to +3 below 100 K, which is correlated with a shrinking by approximately 2% of the tetragonal crystal lattice along the two a-axes. Due to this interconnection between lattice and electronic degrees of freedom the influence of strain in epitaxial thin films is particularly interesting. Ambient x-ray diffraction (XRD) confirms an epitaxial relationship of tetragonal EuPd2Si2 on MgO(001) with an out-of plane c-axis orientation for the thin film, whereby the a-axes of both lattices align. XRD at low temperatures reveals a strong coupling of the thin film lattice to the substrate, showing no abrupt compression over the temperature range from 300 to 10 K. Hard x-ray photoelectron spectroscopy at 300 and 20 K reveals a temperature-independent valence of +2.0 for Eu. The evolving biaxial tensile strain upon cooling is suggested to suppress the valence transition. Instead temperature-dependent transport measurements of the resistivity and the Hall effect in a magnetic field up to 5 T point to a film thickness independent phase transition at 16 to 20 K, indicating magnetic ordering.

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  • Received 26 July 2022
  • Accepted 20 October 2022

DOI:https://doi.org/10.1103/PhysRevMaterials.6.115003

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sebastian Kölsch*, Alfons Schuck, and Michael Huth

  • Thin Films and Nanostructures, Physical Institute, Goethe University Frankfurt, Max-von-Laue Street 1, Frankfurt am Main 60438, Germany

Olena Fedchenko, Dmitry Vasilyev, Sergeij Chernov, Olena Tkach, Hans-Joachim Elmers, and Gerd Schönhense

  • Group Magnetism, Institute of Physics, Johannes Gutenberg University, Staudingerweg 7, Mainz 55128, Germany

Christoph Schlüter, Thiago R. F. Peixoto, and Andrii Gloskowski

  • Photon Science, Deutsches Elektronen-Synchrotron DESY, Notkestasse 85, 22607 Hamburg, Germany

Cornelius Krellner

  • Crystal and Materials Laboratory, Physical Institute, Goethe University Frankfurt, Max-von-Laue Street 1, Frankfurt am Main 60438, Germany

  • *Corresponding author: koelsch@physik.uni-frankfurt.de

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Issue

Vol. 6, Iss. 11 — November 2022

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