Abstract.
Electron paramagnetic resonance (EPR) studies on a single crystal of diamagnetic compound La2Si2O7, potentially a phosphorescent/luminescent/laser material, with the Gd3+ ion substituting for the La3+ ion, were carried out at X-band (9.61 GHz) over the 4–295 K temperature range. The asymmetry exhibited by the Gd3+ EPR line positions for the orientations of the external magnetic field about the magnetic Z- and Y-axes in the ZY-plane was ascribed to the existence of monoclinic site symmetry at the site of the Gd3+ ion, as confirmed by the significant values of the spin Hamiltonian parameters g YZ , b 2 −1, b 4 −m (m = 1, 3), b 6 −m (m = 1, 3, 5), estimated by fitting all EPR line positions observed at room temperature for the orientation of the magnetic field in the magnetic ZX- and ZY-planes using a rigorous least-squares fitting procedure. At 8 K measurements were only carried out for orientation of B in the magnetic ZX-plane, due to difficulty in orientation of the crystal inside the cryostat, enabling estimation of all spin Hamiltonian parameters b n m except those characterized by negative m values and g YZ . The absolute sign of the zero-field splitting parameter b 2 0 was determined to be negative from the relative intensities of the lines at 8 K.
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Authors' address: Sushil K. Misra, Physics Department, Concordia University, 1455 de Maisonneuve Boulevard West, Montreal, Quebec H3G 1M8, Canada
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Misra, S., Andronenko, S. A Variable-Temperature X-Band EPR Study of the Gd3+ Ion in a La2Si2O7 Crystal Characterized by Monoclinic Site Symmetry. Appl Magn Reson 32, 377–384 (2007). https://doi.org/10.1007/s00723-007-0020-5
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DOI: https://doi.org/10.1007/s00723-007-0020-5