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Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.7: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

Effect of substitutions and disorder on the valence transition in YbIn1−x(Ag/Au)xCu4 single crystals — •Michelle Ocker, Bereket Ghebretinsae, Jan Niklas Zimmermann, Bernd Wolf, Kristin Kliemt, Michael Lang, and Cornelius Krellner — Physikalisches Institut, Goethe Universität Frankfurt, 60438 Frankfurt/Main, German

YbInCu4 is one of the rare cases which exhibits a 1st-order valence transition at ambient pressure as a function of temperature around Tv = 42 K [1]. The first-order valence transition line is terminated at a second-order critical endpoint (CEP) [2] where strong fluctuations together with strong coupling effects can be expected. In order to identify these effects and to study them in more detail, single crystalline samples were prepared in In-Cu flux [3]. To tune the material to a point close to the CEP in the valence cross-over region single crystals substituted with silver and gold were prepared. To fine-tune the substituted samples measurements under He-gas pressure were performed. We report on the single crystal growth with different substitution levels and different initial compositions. We present the results of our structural, chemical and physical characterization for the various samples. We show the elastic constant cL(T,p) and discuss the behaviour of the magneto-elastic coupling constant near the CEP.
[1] I. Felner et al., Physical Review B 35, (1987) 6956.
[2] Y. Onuki et al., J. Phys. Soc. Japan 89, (2020) 102001.
[3] J. L. Sarrao et al., Physical Review B 54, (1996) 12207.

Keywords: phase transition; valence cross-over; critical endpoint; crystal growth

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