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TT: Fachverband Tiefe Temperaturen
TT 9: f-Electron Systems and Heavy Fermions II
TT 9.2: Talk
Monday, March 27, 2023, 15:15–15:30, HSZ 201
Exploring the effect of different substitutions on the valence transition in YbInCu4 single crystals — •Michelle Ocker, Bereket Ghebretinsae, Bernd Wolf, Kristin Kliemt, Michael Lang, and Cornelius Krellner — Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt/Main, Germany
At ambient pressure the compound YbInCu4 undergoes a 1st order valence transition at Tv = 42 K by changing the temperature [1]. Thus, ytterbium in the compound is present in the Yb2.9+ state at high temperatures and as Yb2.7+ at low temperatures [2]. In analogy to Eu compounds, the line of first order valence transitions might end in a second order critical endpoint [3]. In order to study the nature of the phase transition in more detail, single crystal samples can be prepared in In-Cu flux which are substituted with silver and gold [4]. With increasing substitution level, 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 substitution levels and the results of our structural, chemical and physical characterization.
[1] I. Felner et al., Phys. Rev. B 35, (1987) 6956
[2] H. Sato et al., Physica B 351, (2004) 298
[3] Y. Ōnuki et al., J. Phys. Soc. Jap. 89, (2020) 102001
[4] J. L. Sarrao et al., Phys. Rev. B 54, (1996) 12207.