Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.4: Poster

Wednesday, March 18, 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 Hossain² — ¹Max 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).