Electron paramagnetic resonance of Gd3 in YCl3·6H2O |
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Authors: | Sushil K. Misra G.R. Sharp |
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Affiliation: | Department of Physics, Concordia University, Sir George Williams Campus, Montreal, Quebec H3G 1M8, Canada |
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Abstract: | The electron paramagnetic resonance spectrum of Gd3+ in YCl3·6H20 with dilution of Gd/Y ions, has been studied with an X-band spectrometer at 295, 77 and 1.77°K and with a K-band spectrometer at 295 and 77°K. The individual values of all the parameters are evaluated from the data at the three temperatures. In particular, the following values for the g-tensor and the zero-field splitting parameters b20 and b22 are obtained from X-band data: at 295°K, gzz = 1.994±0.005, gxx = 1.992±0.005, gyy = 1.997±0.005, b20 = 1.898 ±0.015 GHz, b22 = ?2.247 ± 0.015GHz; at 77°K, gzz = 1.999±0.008, gxx = 2.000±0.008, b20= 1.978 ±0.022 GHz, b22 = ?1.574±0.022GHz; at 1.77°K, gzz = 2.002±0.010, gxx = 1.990 ±0.010, b20 = 2.011 ± 0.025 GHz, b22 = ?1.650 ±0.025 GHz. (The K-band values are found to be consistent with the X-band values). From the angular dependence of the data in the ZX plane (i) the angle X0 which the Z axis makes with the a vector of the unit cell, is determined to be 58.00 ±0.25° and (ii) the existence of pseudo-symmetry axes at ±5° from the Z axis in the ZX plane as found by heat capacity and specific heat data has been confirmed. An estimate is also made of the extent of admixture of the excited state with the ground state . |
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