Regensburg 2019 – wissenschaftliches Programm
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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 Luther1,2, Ilya Sheikin3, Rikio Settai4, Jochen Wosnitza1,2, 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 TN = 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 TN, 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.