Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Correlated Electrons: Poster Session

TT 21.4: Poster

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

YbIn_1−xAg_xCu₄: single crystal growth and characterisation — •Michelle Ocker, Bereket Ghebretinsae, Kristin Kliemt und Cornelius Krellner — Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt/Main, Germany

The compound YbInCu₄ undergoes a 1^st order valence transition at T_v =42 K by changing the temperature. Thus, ytterbium in the compound is present in the Yb^2.9+ state at high temperatures and as Yb^2.7+ at low temperatures [1]. In analogy to Eu compounds, the first order valence transition is suspected to end in a second order critical endpoint [2]. In order to study this valence transition in more detail, single crystal samples can be prepared in In-Cu flux which are substituted with silver [3]. With increasing Ag content, negative chemical pressure within the crystal is increased and the characteristics of the valence transition changes significantly. Here, we report on the single crystal growth with different Ag substitution levels and the results of our structural, chemical and physical characterization.

[1] H.Sato et al., Physica B 351, (2004) 298

[2] Y. Ōnuki et al., J. Phys. Soc. Jpn. 89, (2020) 102001

[3] J. L. Sarrao et al., Phys. Rev. B 54, (1996) 12207