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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.10: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

⁵⁹Co NMR magnetometry of the heavy-fermion compound CeCoGe₃ — •Sven Luther^1,2, Ilya Sheikin³, Rikio Settai⁴, Jochen Wosnitza^1,2, and Hannes Kühne¹ — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — ²Institut für Festkörper- und Materialphysik, TU Dresden, Germany — ³Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, Grenoble, France — ⁴Department of Physics, Niigata University, Japan

The tetragonal heavy-fermion compound CeCoGe₃ yields, as established by thermodynamic probes, a complex magnetic phase diagram with several zero-field transitions to and between antiferromagnetically ordered phases below T_N = 20 K. We present a detailed, microscopic study of one of these magnetic phases via ⁵⁹Co (I = 7/2) NMR at 2 T. Here, below T_N, the symmetry breaking by magnetic order results in three inequivalent Co-sites with corresponding local sublattice magnetizations. These temperature-dependent internal fields can well be described by an Ising-type mean-field formalism. In addition to the antiferromagnetic order, which is compatible with neutron-scattering results, the analysis yields an additional uniform part, which could be induced by an unusually high polarization of hybridized conduction electrons.