Electron spin resonance of the itinerant ferromagnets LaCrGe, CeCrGeand PrCrGe.

We report electron spin resonance of the itinerant ferromagnets LaCrGe, CeCrGe, and PrCrGe. These compounds show well defined and very similar spectra of itinerant Cr 3spins 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.

Large magnetocaloric effect and adiabatic demagnetization refrigeration with YbPt2Sn.

Adiabatic demagnetization is currently gaining strong interest in searching for alternatives to (3)He-based refrigeration techniques for achieving temperatures below 2 K. The main reasons for that are the recent shortage and high price of the rare helium isotope (3)He. Here we report the discovery of a large magnetocaloric effect in the intermetallic compound YbPt2Sn, which allows adiabatic demagnetization cooling from 2 K down to 0.