Why rare-earth ferromagnets are so rare: insights from the p-wave Kondo model

Shadab Ahamed, Roderich Moessner, Onur Erten

Magnetic exchange in Kondo lattice systems is of the Ruderman-Kittel-Kasuya-Yosida type, whose sign depends on the Fermi wave vector, $k_F$ . In the simplest setting, for small $k_…