Electron paramagnetic resonance of Er3+, Dy3+, and Gd3+ in Y(CF3SO3)3⋅9H2O

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Abstract
The paramagnetic resonance spectra of 1% Er3+ and 1% Dy3+ substituted in hexagonal Y(CF3SO3)3⋅9H2O (YTFMS) single crystals have been measured at 4.2 K and 9.215 GHz. Resonances due to Gd3+ impurities were identified and studied at 77 K. In each case, the results strongly resemble those for the given ion in an Y(C2H5SO4)3⋅9H2O (YES) or La(C2H5SO4)3⋅9H2O (LaES) host suggesting that R3+ site symmetry in YTFMS is also C3h. For Er3+, the spin Hamiltonian parameters are found to be g∥ =1.62, g⊥ =8.67, A=0.006 cm−1, B=0.030 cm−1, and P=0.001 cm−1. For Gd3+ we find g=1.988, b02 =0.010 88 cm−1, b04 =−0.000 418 cm−1, and b06 =0.000 058 cm−1. In the case of Dy3+, resonance is observed for ions whose major g‐tensor axis coincides with the YTFMS c axis and have g∥ =10.90 and g⊥ ≊0. Another resonance, which splits into a six line pattern when the field is rotated away from the c axis, is attributed to ions whose g tensors are tipped by 20° from that axis by the perturbing effect of lattice imperfections. These have gx =3.79, gy =2.41, and gz =10.84 and are believed to be relatively few in number. Similar tipping is seen for Dy3+ in YES.