Dramatic impact of the giant local magnetic fields on spin-dependent recombination processes in gadolinium based garnets

A giant magnetic field effect on spin-dependent recombination of the radiation-induced defects has been found in cerium doped gadolinium based garnet crystals and ceramics, promising materials for scintillator applications. A sharp and strong increase in the afterglow intensity stimulated by externa...

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Bibliographic Details
Published in:Applied physics letters 2015-06, Vol.106 (26)
Main Authors: Romanov, N. G., Tolmachev, D. O., Gurin, A. S., Uspenskaya, Yu. A., Asatryan, H. R., Badalyan, A. G., Baranov, P. G., Wieczorek, H., Ronda, C.
Format: Article
Language:English
Subjects:
AFTERGLOW
Applied physics
CERAMICS
CERIUM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Cross relaxation
Crystal defects
CRYSTALS
DOPED MATERIALS
Electron spin
ELECTRONS
GADOLINIUM
GADOLINIUM IONS
GARNETS
HOLES
Ion recombination
MAGNETIC FIELDS
Magnetism
Radiation effects
RECOMBINATION
RELAXATION
Scintillation counters
SPIN
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Summary:A giant magnetic field effect on spin-dependent recombination of the radiation-induced defects has been found in cerium doped gadolinium based garnet crystals and ceramics, promising materials for scintillator applications. A sharp and strong increase in the afterglow intensity stimulated by external magnetic field and an evidence of the magnetic field memory have been discovered. The effect was ascribed to huge Gd-induced internal magnetic fields, which suppress the recombination, and cross-relaxation with Gd3+ ions leading to reorientation of the spins of the electron and hole centers. Thus, the spin system of radiation-induced defects in gadolinium garnet based scintillator materials was shown to accumulate significant energy which can be released in external magnetic fields.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4923200