A Low Temperature (10 K) High-Frequency (208 GHz) EPR Study of the Non-Kramers Ion Mn~(3+) in a MnMo_6Se_8 Single Crystal

摘要

A high-frequency (208 GHz) electron paramagnetic resonance (EPR) study on Mn~(3+) (3d~4, S = 2) ions embedded in a MnMo_6Se_8 single crystal has been performed at 10 K. The experimental spectra reveal the presence of only one set of EPR lines from Mn~(3+) ions, whose magnetic axes are oriented along the crystal axes. The spin-Hamiltonian parameters are evaluated by the method of least-squares, fitting all the observed line positions simultaneously, for the three orthogonal orientations of the external magnetic field. The symmetry of the spin Hamiltonian at the site of the Mn~(3+) ions has been deduced from the EPR spectra.