Hyperfine and Nuclear Quadrupole Interactions in Copper-Doped TiO2

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Abstract
Single crystals of TiO2:Cu2+ have been investigated at 20 K using the technique of electron paramagnetic resonance. The major features of the EPR spectra can be attributed to divalent copper (3d9) in substitutional (Ti4+) sites. Information has been gained about both isotopes of copper and about the interactions which concern this ion. For the substitutional site, the spin-Hamiltonian parameters in the S=12, I=32 manifold are: gx=2.109, gy=2.094, gz=2.346, Ax63=+18.7×10−4 cm−1, Ay63=+27.2×10−4 cm−1, Az63=−87.5×10−4 cm−1, Ax65=+18.8×10−4 cm−1, Ay65=+28.7×10−4 cm−1, Az65=−93.7×10−4 cm−1, Px=−2.56×10−4, Py=−2.37×10−4, and

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