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Γ8(3) Resonance In Esr Of (Ery)Al2 Single Crystals, U. Döbler, K. Baberschke, S. E. Barnes

Physics Articles and Papers

Angle-dependent ESR results are given for 500-, 2500-, and 5000-ppm Er-doped YAl₂ single crystals. An almost perfect analysis of the X- and Q-band data is achieved if the admixture of the first excited state Γ₈⁽²⁾ into the ground state Γ₈⁽³⁾ via the Zeeman interaction is taken into consideration. This enables us to determine the crystal electric field (CEF) parameter x=-0.322(20) and W=-0.29(2) K. The g-value shift yields N(E_F)J^Δg=+0.09(5) and the thermal broadening of the linewidth |N(E_F)J^ΔH|=0.059(5). The precision of the experimental data allows, in principle, the determination …