SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Poster: Correlated Electrons I

TT 42.3: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG2

Searching for the critical endpoint in cobalt-doped EuRh2Si2 — •Franziska Walther, Alexej Kraiker, Kristin Kliemt, and Cornelius Krellner — Physikalisches Institut, Goethe-Universität Frankfurt, 60438 Frankfurt/Main, Germany

The ternary europium-based intermetallic compounds with the ThCr2Si2-type structure show a variety of intriguing physical properties due to the coupling between lattice and electronic degrees of freedom. Eu ions can be present in a magnetic divalent or non-magnetic trivalent state. Under variation of temperature and pressure, it’s possible to enforce a valence transition associated with a change of the unit cell volume [1]. At ambient pressure, EuRh2Si2 orders antiferromagnetically below TN= 24 K in a stable divalent state [2], whereas the isoelectronic related compound EuCo2Si2 is nearly trivalent und indicates no magnetic ordering [1]. EuRh2Si2 undergoes a pressure-induced first order valence transition [3]. We expect the second order critical endpoint in the pressure range from 1.7 to 2.1 GPa, where the first-order phase transition terminates and critical elasticity may occur. We want to approach the critical endpoint by applying chemical pressure through substituting Rh in EuRh2Si2 with Co. We report on the growth of samples of the Eu(Rh1−xCox)2Si2 -system and the characterization of their physical and chemical properties.
[1] Y. Onuki et al., J. Phys. Soc. Japan 89, 102001 (2020)
[2] S. Seiro, C. Geibel, J. Phys.: Condens. Matter 26, 046002, (2014)
[3] F. Honda et al., J. Phys. Soc. Japan 85, 063701 (2016)

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