Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1

TT 34.11: Vortrag

Mittwoch, 18. März 2020, 12:15–12:30, HSZ 204

Crystal growth and characterization of isotope-pure YbRh2Si2 (171Yb, 173Yb, 174Yb) — •Sebastian Witt1, Susanna Rongstock1, Thanh Duc Nguyen1, Manuel Brando2, and Cornelius Krellner11Physikalisches Institut, Goethe University, Frankfurt, Germany — 2Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany

A central question in condensed matter research concerns the interplay between quantum criticality and unconventional superconductivity in strongly correlated electron systems such as heavy-electron systems. Recently, superconductivity was also discovered in the quantum-critical material YbRh2Si2 at 2mK [1]. So far the interplay between electronic and nuclear moments of Yb and its impact on the superconductivity is not settled. For that reason, it is essential to investigate YbRh2Si2 samples with a well-defined Yb nuclear spin.

In this talk, we report the crystal growth with the entire range of nuclear spin number in the single crystals (171Yb: I = 1/2, 173Yb: I = 5/2, 174Yb: I = 0). For the crystal growth we developed a new setup for small masses, especially for the metallothermic reduction of metallic Yb from Yb2O3. Besides the single crystal characterization (Laue, PXRD) we will present measurements of the resistivity and isotopic composition. To investigate the influence of nuclear spin on the electronic degrees of freedom, we will show the heat capacity around the antiferromagnetic transition at 70mK.

[1] E. Schuberth et al., Science, 351, 485-488 (2016).

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