Microwave magnetoabsorption in the CeAl2 magnetic Kondo lattice at low temperatures

The magnetic phase diagram of the CeAl₂ magnetic Kondo lattice was studied using microwave magnetoabsorption spectroscopy at frequencies of 37–118 GHz, temperatures of 1.8–4.6 K, and magnetic fields of up to 70 kOe. The observed anomalies in magnetoabsorption, when combined with the change in the carrier scattering pattern in (established in galvanomagnetic measurements) CeAl₂ near H*≈35 kOe at liquid-helium temperatures, suggest that this compound undergoes a sequence of magnetic transitions accompanied by strong spin fluctuations. The nature of the magnetic phases and the mechanisms driving the phase transformations in CeAl₂ are discussed.