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TT: Fachverband Tiefe Temperaturen

TT 4: f-Electron Systems and Heavy Fermions I

TT 4.9: Vortrag

Montag, 27. März 2023, 11:45–12:00, HSZ 201

Search for a critical endpoint in Eu(Pd1-xAux)2Si2 single crystals — •Robert Möller, Marius Peters, Kristin Kliemt, and Cornelius Krellner — 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 0.04 and 0.2 the transition becomes a first order phase transition [3]. Using single crystals grown with the Czochralski method, several characterisations were done to understand the main factors affecting the valence transition of Eu(Pd1-xAux)2Si2.
[1] Y. Onuki et al., Phil. Mag. 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., Phys. Rev. Lett. 49, 1947 (1982)