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TT: Fachverband Tiefe Temperaturen

TT 4: f-Electron Systems and Heavy Fermions I

TT 4.6: Vortrag

Montag, 27. März 2023, 10:45–11:00, HSZ 201

Epitaxial EuPd₂ and EuPd₃ thin films — •Sebastian Kölsch and Michael Huth — Goethe Universität, Frankfurt (Main)

Europium-based binary compounds reveal a variety of interesting phenomena, which are attributed to strong electronic correlations and a competition between two different valence states of the europium ion, which lie close in energy [1]. As a result Eu forms intermetallic compounds usually either in a divalent (e.g. EuPd₂) or trivalent (e.g. EuPd₃) state, depending on the surrounding environment, whereas most other rare earth elements are always trivalent. Some ternary compounds even exhibit a change between both valence states, which may be tuned by temperature, pressure or high magnetic fields. As one of these rare candidates, EuPd₂Si₂ gained much interest due to a temperature driven valence transition from nearly Eu²⁺ above  200 K to Eu³⁺ below  50 K [2]. Recently we achieved for the first time the growth of epitaxial EuPd₂Si₂ thin films, where the valence transition was completly suppressed due to biaxial strain [3]. Epitaxial thin films thus offer the possibility to manipulate the strongly correlated Eu-based systems. Here we present the successful growth of EuPd₂ and EuPd₃ as epitaxial thin films and report on first results regardings their properties.
[1] Y. Onuki et al., Phil. Mag. 97, 36 (2017)
[2] K. Kliemt et al., Crys. Grow. & Des., 2022
[3] S. Kölsch et al., PRM 6, 2022