Abstract
We report electron spin resonance of the itinerant ferromagnets LaCrGe3, CeCrGe3, and PrCrGe3. These compounds show well defined and very similar spectra of itinerant Cr 3d 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 4f and 3d magnetism which appears quite remarkable since CeCrGe3 displays heavy fermion behavior even in the magnetically ordered state.
Highlights
The interplay between local 4 f magnetism and itinerant 3d ferromagnetism is an important topic in heavy fermion systems and superconducting pnictide systems [1, 2]
We report the Cr3+ electron spin resonance (ESR) in LaCrGe3, CeCrGe3, and PrCrGe3 in which the magnetism is based on different interactions between 3d and 4 f electrons, namely pure itinerant 3d magnetism (LaCrGe3, 4 f 0), heavy fermion ferromagnetism with 3d–4 f hybridization (CeCrGe3, 4 f 1), and itinerant 3d/local 4 f magnetism (PrCrGe3, 4 f 2)
The results of the ESR study on LaCrGe3, CeCrGe3 and PrCrGe3 are similar in the paramagnetic region but strongly depend on the presence of 4 f electrons for temperatures close to and below the ferromagnetic ordering temperature TC, see figure 5
Summary
The interplay between local 4 f magnetism and itinerant 3d ferromagnetism is an important topic in heavy fermion systems and superconducting pnictide systems [1, 2]. This is relevant for systems such as CeCrGe3 which show 4 f Kondo lattice and heavy fermion behavior in the presence of. The roles of spin fluctuations and quantum criticality in itinerant ferromagnetic systems were investigated in the systems LaVxCr1−xGe3 and CeCr1−xTixGe3 where a strong suppression of ferromagnetic order was observed [5, 6]. Distinct differences in the ESR properties of these compounds are mainly found in the ferromagnetically ordered state
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