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MA: Fachverband Magnetismus
MA 41: Poster III
MA 41.43: Poster
Donnerstag, 20. März 2025, 15:00–17:30, P3
Stoichiometry-control of topological ground states in the Kondo lattice CeAlGe — •Soohyeon Shin1,2, Igor Plokhikh2, Jonathan White2, Vladimir Pomjakushin2, Pascal Puphal3, and Ekaterina Pomjakushina2 — 1Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich, Lichtenbergstrasse 1, D-85747 Garching, Germany — 2PSI Center for Neutron and Muon Sciences, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland — 3Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
CeAlGe crystalises in tetragonal structure I41md, where the spatial-inversion symmetry is broken, and is expected to exhibit Weyl fermions near a Fermi surface that becomes more stable by broken time-reversal symmetry. CeAlGe grown by the flux method, off-stoichiometric case, exhibits a commensurate antiferromagnetic order below T = 5.1 K, whereas the crystal grown by floating-zone methods with 30 bar of Ar gas (p=30 bar), stoichiometric case, exhibits an incommensurate order below T = 4.4 K in which topological Hall effects are induced by external magnetic fields applied in the c-axis. In this presentation, we show the newly synthesised CeAlGe using the same floating-zone method but with lower Ar pressure of p=5 bar. Our neutron diffraction and electrical Hall transport experiments revealed that the topological magnetism remains with shorter periodicity. Given all experimental results of flux-grown and two floating-zone-grown CeAlGe, we will discuss the mechanism of topological magnetism with respect to the Kondo coupling strength.
Keywords: Topologica magnetism; Half-skyrmion; Meron; Kondo; Stoichiometry