Pulse-electron paramagnetic resonance of Cr3+ centers in SrTiO3

Azamat, D. V.; Dejneka, A.; Lancˇok, J.; Trepakov, V. A.; Jastrabik, L.; Badalyan, A. G.
May 2013
Journal of Applied Physics;May2013, Vol. 113 Issue 17, p174106
Academic Journal
Electron paramagnetic resonance on chromium doped SrTiO3 samples grown using the Verneuil technique shows the presence of charge-compensated Cr3+-VO as one of the dominant chromium centers. The spin-lattice relaxation processes have been investigated in samples with both isotropic Cr3+ and Cr3+-VO centers in heavily doped SrTiO3. The relaxation of longitudinal magnetization was dominated by the sum of two exponentials with two time constants (i.e., a slow and a fast constant) at liquid-helium temperatures. The results of fitting the temperature variation of T1 suggest that the dominant exponential contribution is related to the spin-phonon relaxation time arising from the local phonon mode.


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