Electron Paramagnetic Resonance of Gd3+ in Single Crystals of Various Rare-Earth Ethyl Sulfates at Room Temperature and at 77°K

Electron paramagnetic resonance studies of Gd3+ in single crystals of Ln(C2H5SO4)3· 9 H2O (where Ln3+ denotes La3+, Pr3+, Nd3+, Sm3+, Tb3+, Dy3+, Ho3+, Er3+, Yb3+, and Lu3+) have been carried out at X band at room temperature and at 77°K. The spin Hamiltonian parameters b20, b40, and b60 and g‖ have been evaluated at both temperatures for each host except terbium ethyl sulfate at 77°K. The absorption linewidths for each transition have been measured at both temperatures. The present results are compared with previous results. A principal conclusion is that the magnitude of b20 for Gd3+ in the various rare-earth ethyl sulfates is more nearly a linear function of the ionic radius of the trivalent host ion than of its atomic number.