Abstract
The results of X-band electron paramagnetic resonance (EPR) measurements ofCo2+ ionsin YAlO3 (YAP) crystals in the temperature range 1.8–40 K are presented. The temperature andangular dependences of EPR spectra have been analysed using a triclinic spin Hamiltonian(SH) consisting of the electronic Zeeman and hyperfine terms. Two distinct positionsα andβ areidentified for Co2+ complexes and ascribed to the substitutionalCo2+ ionsat the Al3+ and Y3+ sites, respectively. The values of the SH parameters are obtained by least squares fitting theα- andβ-typeCo2+ spectra yielding the principal (orthorhombic-like) values of the tensorsg andA as wellas the orientation of their principal axes. The additionally observed EPR spectra of the unintentionalimpurities Nd3+ and Er3+ in YAP crystals are also analysed.
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