Spin dephasing in the excited triplet state of F+ -center pairs in CaO

R. Hond; M. Glasbeek

doi:doi:10.1051/jphyscol:19806142

Issue		J. Phys. Colloques Volume 41, Number C6, Juillet 1980 THIRD EUROPHYSICS TOPICAL CONFERENCE LATTICE DEFECTS IN IONIC CRYSTALS


Page(s)		C6-540 - C6-540
DOI		https://doi.org/10.1051/jphyscol:19806142

THIRD EUROPHYSICS TOPICAL CONFERENCE
LATTICE DEFECTS IN IONIC CRYSTALS

J. Phys. Colloques 41 (1980) C6-540-C6-540
DOI: 10.1051/jphyscol:19806142

Spin dephasing in the excited triplet state of F₊ -center pairs in CaO

R. Hond et M. Glasbeek

Laboratory for Physical Chemistry, University of Amsterdam, Nieuwe Achtergracht 127, Amsterdam, The Netherlands

Abstract
Spin coherence decay in the photo-excited ³B₁ state of exchange-coupled F⁺ -center pairs in CaO is studied utilizing techniques for the optical detection of spin echoes and spin locking. The homogeneous dephasing time is shown to decrease rapidly with increasing (low) magnetic field strengths. The phenomenon arises because H induces a magnetic moment within the triplet spin system and as a result dipolar spin-spin interactions become increasingly important in the dephasing processes. As the temperature is raised from 1.5 K up to 10 K, the spin-echo decay shapes are changed from exponential to Gaussian whereas the dephasing time, T^M, is increased from 150 µs up to 300 µs. The results are related to existing spectral diffusion theories.