Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Correlated Electrons: Poster Session

TT 21.2: Poster

Mittwoch, 7. September 2022, 15:00–18:00, P1

Single crystal growth and characterization of Eu(Pd1-xAux)2Si2 — •Robert Möller, Marius Peters, Cornelius Krellner, and Kristin Kliemt — Physikalisches Institut, Goethe-Universität Frankfurt, Germany

In a general phase diagram for Eu compounds [1], the intermediate valent EuPd2Si2, TV -.8ex~ 150 K, is located very close, but slightly at the high-pressure side of a second order critical endpoint [2]. The analysis of polycrystalline samples of Eu(Pd1-xAux)2Si2 revealed that in this series a critical endpoint can be found which separates the region of continuous from first order transitions. It was shown that the valence state of the material can be tuned via Au substitution and that for x between 0.05 and 0.2 the transition becomes a first order phase transition [3]. In this contribution, we present the Czochralski growth and the characterization of Eu(Pd1-xAux)2Si2 single crystals. Using magnetization and heat capacity measurements, we study the changes in the nature of the phase transition in detail.
[1] Y. Onuki et al., Philosophical Magazine 97, 3399 (2017)
[2] B. Batlogg et al., in: Wachter, Boppart (eds.): Valence Instabilities, North-Holland publishing company (1982)
[3] C. U. Segre et al., Physical Review Letters 49, 1947 (1982)