Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Correlated Electrons: Poster Session
TT 21.6: Poster
Mittwoch, 7. September 2022, 15:00–18:00, P1
Valence fluctuations and structural collapse in Eu-based phosphides EuT2P2 — Marius Peters1, •Kristin Kliemt1, Julian Dominik Reusch1, Thanh Duc Nguyen1, Franziska Walther1, Michael Merz2, Gaston Garbarino3, Sofia Michaela Souliou2, Matthieu Le Tacon2, Amir-Abbas Haghighirad2, and Cornelius Krellner1 — 1Kristall- und Materiallabor, Physikalisches Institut, Goethe University Frankfurt, Max-von-Laue-Str. 1, D-60438 Frankfurt — 2Karlsruhe Institute of Technology, Institute for Quantum Materials and Technology, D-76021 Karlsruhe — 3European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble
Studies of enhanced coupling between electrons and phonons is focussed on materials exhibiting phase transitions involving both electronic and lattice degrees of freedom. Europium in intermetallic systems can exhibit different magnetic ground states: If the ground state is Eu2+, the system shows long range magnetic order; if the ground state is Eu3+, no magnetic order is observed. Instead, valence fluctuations occur in intermediate valent states [1].
In this work, we report on the structural collapse in divalent europium systems EuT2P2 (T = Fe, Co, Ru), which is connected to a change of europium’s ground state by using single crystal diffractometry at pressures up to 15 GPa at 15 K and 300 K. Additionally, we show characterizations of the electronic and structural contributions to valence fluctuations in EuNi2P2.
[1] Y. Onuki et al., Philos. Mag. 97, 3399 (2017).