Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.4: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Electron Spin Resonance of the itinerant ferromagnets CeCrGe3 and LaCrGe3 — •Jörg Sichelschmidt1, Thomas Gruner1, Christoph Geibel1, Debarchan Das2, and Zakir Hossain21Max Planck Institute for Chemical Physics of Solids, 01187 Dresden — 2Department of Physics, Indian Institute of Technology, Kanpur 208016, India

We report Electron Spin Resonance (ESR) of the itinerant ferromagnets CeCrGe3 and LaCrGe3. Both compounds show well defined and very similar spectra of itinerant Cr 3d spins in the paramagnetic temperature region, adding another two examples of a rarely observed conduction electron spin resonance in 3d metals.
Upon cooling and crossing the Cr-FM ordering (below around 90 K) strong spectral structures start to dominate the resonance spectra in a quite different manner in CeCrGe3 and LaCrGe3. In the Ce-compound the resonance is visible in the paramagnetic region only whereas in the La-compound the resonance can be followed far below the FM ordering temperature. This behavior will be discussed in terms of the specific interplay between Ce and Cr magnetism which appears quite remarkable since CeCrGe3 displays Kondo lattice behavior with a heavy fermion specific heat even in the magnetically ordered state [1].

[1] D. Das, T. Gruner, H. Pfau, U. B. Paramanik, U. Burkhardt, C. Geibel, and Z. Hossain, J. Phys. Condens. Matter 26, 106001 (2014).

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