Electron spin relaxation of the Jahn-Teller Cu(H sub(2)O) sub(6) complex in Cs sub(2)Zn(SO sub(4)) sub(2) times 6H sub(2)O crystals

The electron spin-lattice and phase relaxation times were measured by electron spin echo (ESE) method in the temperature range 10-50 K, where Jahn-Teller dynamics of the Cu(H sub(2)O) sub(6) complexes is too slow to dominate in the EPR spectra of Cu super(2+) in Cs sub(2)Zn(SO sub(4)) sub(2) times 6...

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Bibliographic Details
Published in:Solid state communications 2001-01, Vol.117 (5), p.333-336
Main Authors: Hoffmann, S K, Goslar, J, Hilczer, W, Kaszynski, R, Augustyniak-Jablokow, M A
Format: Article
Language:English
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Summary:The electron spin-lattice and phase relaxation times were measured by electron spin echo (ESE) method in the temperature range 10-50 K, where Jahn-Teller dynamics of the Cu(H sub(2)O) sub(6) complexes is too slow to dominate in the EPR spectra of Cu super(2+) in Cs sub(2)Zn(SO sub(4)) sub(2) times 6H sub(2)O. The spin-lattice relaxation is governed by ordinary the two-phonon Raman processes which overdominate the effects expected from the Jahn-Teller dynamics. It allowed us to determine the Debye temperature of Cs sub(2)Zn(SO sub(4)) sub(2) times 6H sub(2)O crystals as theta sub(D) identical with 220 K. The ESE amplitude decay is governed by nuclear spectral diffusion below 23 K with phase memory time T sub(M) identical with 5 mu s. At this temperature a broadening of the lines in FT-ESE spectrum (pseudo-ENDOR spectrum) appears, and then a continuous acceleration of the phase relaxation on heating is observed. This is due to the excitations to the vibronic level of energy 71 cm super(-1) in the deepest well of the potential energy surface.
ISSN:0038-1098