SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.13: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG3

Probing the electron-lattice coupling near the valence transition in YbLn1−xAgxCu4 — •Jan Zimmermann, Bernd Wolf, Michelle Ocker, Kristin Kliemt, Cornelius Krellner, and Michael Lang — PI, SFB/TR288, Goethe Univ., Frankfurt/M,. Deutschland

The recently proposed phenomenon of critical elasticity is linked to a non-perturbatively strong coupling between lattice- and critical electronic degrees of freedom [1]. Intermetallic compounds that show various types of phase transitions such as valence- or structural instabilities that make it possible to study such collective phenomena, are currently a field of high interest. It has been shown that doping can be used in EuPd2(Si1−xGex)2 to generate chemical pressure which may open up the possibility to experimentally access directly the area around the critical endpoint [2]. It is expected to find similar effects for the valence transition in the doped intermetallic compound YbLn1−xAgxCu4 [3]. We are investigating the elasticity of YbLn1−xAgxCu4 using ultrasound-wave-propagation. In addition to measurements performed under variable temperature, we have developed a new setup that allows ultrasonic measurements to be performed under variable He-gas pressure. We will discuss first results on the elasticity, in comparison with data on the magnetic susceptibility, and highlight the additional experimental possibilities the new setup offers.
[1] E. Gati et al., Sci. Adv. 2, e1601646 (2016)
[2] B. Wolf et al., arXiv:2210.12227, (2022)
[3] S. Zherlitsyn et al., Phys. Rev. B, 60, 5, (1999)

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