Paramagnetic Resonance in an Excited State of TmN: Crystal-Field and Exchange Effects

Abstract
Paramagnetic resonance has been observed in an excited Γ5 triplet state 222°K above the singlet Γ1 ground state of Tm3+ (4f12) in TmN (NaCl structure). Much of the observed behavior is understood with exchange small compared with crystal-field effects; however, there is an anomalous minimum in the temperature variation of the resonant g.