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Electron Spin Resonance and Optical Absorption of Ti3+ and V3+ in CuAlS2

Electron spin resonance (ESR) and optical absorption spectra have been studied in Ti- and V-doped CuAlS2 crystals, grown by the chemical vapour transport technique. Identification of the ESR centers as being due to Ti3+ and V3+ has been confirmed by the observation of hyperfine structures arising from hyperfine interaction with four second-shell 27Al nuclei (titanium-case) and with the nuclear magnetic moment of 51V (vanadium case). The results obtained show that both Ti and V in CuAlS2 are trivalent, with Ti3+ ions substituting for Al3+-sites and V3+ ions substituting for Cu+-sites.