SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.12: Poster

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

Thermal expansion measurements at low temperatures of a valence fluctuating system close to a critical endpoint. — •Arif Ata, Bernd Wolf, Jan Zimmermann, Marius Peters, Kristin Kliemt, Cornelius Krellner, and Michael Lang — PI, SFB/TRR288, Goethe Univ., Frankfurt/M., Germany

Thermodynamic investigations of highly correlated electron systems at low-temperatures are of general interest. Especially strong-coupling effects between lattice- and electronic degrees of freedom, which are expected around second-order critical endpoints [1], have become topics of current interest. These include phenomena such as critical softening and deviations from Hooks law of elasticity [1]. The intermetallic compound EuPd2Si2 and its Ge-doped variants, which show different kinds of phase transitions such as valance- and magnetic- transitions, are promising target materials for such investigations [2]. Of particular interest is the possibility to approach the critical regime by the combination of chemical pressure (Ge-doping) and He-gas pressure. In this work we present results of thermal expansion measurements on single crystalline EuPd2(Si1−xGex) as a function of temperature for 4.2 K ≤ T ≤ 300 K and He-gas pressure P ≤ 12 kbar The data have been obtained by using a strain gauge, enabling measurements of thermal expansion and compressibility to be performed at high pressure, i.e., in P-T parameter ranges where He is in its solid phase.
[1] E. Gati et al., Sci. Adv. 2, e1601646 (2016).
[2] Y. Onuki et al., Philosophical Magazine 97, 3399 (2017).

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