Dresden 2020 – wissenschaftliches Programm
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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 . First reports on the synthesis of single crystals came up only recently , 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.
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