Electron spin resonance of the itinerant ferromagnets LaCrGe 3 , CeCrGe 3 and PrCrGe 3 .

We report electron spin resonance of the itinerant ferromagnets LaCrGe ₃ , CeCrGe ₃ , and PrCrGe ₃ . These compounds show well defined and very similar spectra of itinerant Cr 3 d spins in the paramagnetic temperature region. Upon cooling and crossing the Cr-ferromagnetic ordering (below around 90 K) strong spectral structures start to dominate the resonance spectra in a quite different manner in the three compounds. In the Ce- and Pr-compounds the resonance is only visible in the paramagnetic region whereas in the La-compound the resonance can be followed far below the ferromagnetic ordering temperature. This behavior will be discussed in terms of the specific interplay between the 4 f and 3 d magnetism which appears quite remarkable since CeCrGe ₃ displays heavy fermion behavior even in the magnetically ordered state.
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