Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1

TT 34.10: Vortrag

Mittwoch, 18. März 2020, 12:00–12:15, HSZ 204

Crystal growth of the valence fluctuating system EuPd2Si2 — •Marius Peters, Kristin Kliemt, Eunhyung Cho, Doan-My Tran, Franz Ritter, and Cornelius Krellner — Physikalisches Institut, Goethe-Universität Frankfurt

The study of collective phenomena raising from enhanced coupling between electrons and phonons is focussed on materials exhibiting phase transitions involving both electronic and lattice-degrees of freedom. One system providing such a strongly coupled phase transition is EuPd2Si2 of the ThCr2Si2 structural type, showing a temperature induced valence transition of europium between the energetically vicinal valence states Eu2+ and Eu3+ at about 170K [1]. First reports on the synthesis of single crystals came up only recently [2], but a deep investigation of the valence transition in this compound is still missing.
We approached the ternary Eu-Pd-Si system using differential thermal analysis to map the local composition phase diagram. We used the Bridgman and the Czochralski method fort he successful growth of mm-sized single crystals of EuPd2Si2. In this contribution we will present chemical and structural characterization of these crystals and some preliminary physical measurements around the valence transition.
[1] E. V. Sampathkumaran et al., Journal of Physics C14, L237 (1981).
[2] Y. Onuki et al., Philosophical Magazine 97, 3399 (2017).

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