Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.8: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Towards the crystal growth of nuclear spin tuned YbRh₂Si₂ — •Thanh Duc Nguyen, Doan-My Tran, Sebastian Witt, and Cornelius Krellner — Physikalisches Insitut, Goethe-Universität Frankfurt am Main, D-60438 Frankfurt

The investigation of the heavy fermion compound YbRh₂Si₂ allows new insights concerning the interplay of quantum phase transitions and superconductivity. The compound shows at 70mK antiferromagnetic order which can be further suppressed to a quantum critical point. Recently, at 2mK a superconducting state was discovered [1]. Due to the ordering of the nuclear spin of ¹⁷¹Yb and ¹⁷³Yb before the superconducting state emerges it is a matter of particular interest to investigate the evolution of the superconductivity in single crystals with pure zero and non-zero nuclear spins of the Yb-isotopes. To this end, we first need to optimize the metallothermic reduction of the rare earth element as the isotopes are only available as oxides. Furthermore, we present the optimization of down-scaling in mass the single crystal growth and we report two ways to regaining ytterbium from foreign phase YbRhIn₅.
E. Schuberth et al., Science 351, 485 (2016).