Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Quantum-Critical Phenomena I
TT 50.1: Vortrag
Mittwoch, 14. März 2018, 09:30–09:45, H 3005
Uniaxial stress tuning of geometrical frustration in a Kondo lattice — R. Küchler1,2, C. Stingl2, Y. Tokiwa2, M.S. Kim3, T. Takabatake3, and •P. Gegenwart2 — 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 2Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany — 3Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan
Hexagonal CeRhSn with paramagnetic 4f moments on a distorted Kagome lattice displays zero-field quantum critical behavior related to geometrical frustration [1]. We report high-resolution thermal expansion and magnetostriction measurements under multiextreme conditions such as uniaxial stress up to 200 MPa, temperatures down to 0.1 K and magnetic fields up to 10 T. Under uniaxial stress along the a-direction, quantum criticality disappears and a complex magnetic phase diagram arises with a sequence of phases below 1.2 K and fields between 0 and 3 T (∥ a). Since the Kondo coupling increases with stress, which alone would stabilize paramagnetic behavior in CeRhSn, the observed order arises from the release of geometrical frustration by in-plane stress.
Y. Tokiwa, C. Stingl, M.-S. Kim, T. Takabatake, and
P. Gegenwart, Sci. Adv. 1, e1500001(2015).