Tunneling migration of self-trapped holes in AgCl

Goldenberg, S.S.; Kao, Chien-Teh; Rowan, L. G.; Slifkin, Lawrence

doi:10.1103/physrevb.46.2809

Cited by 2 publications

(1 citation statement)

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“…The results for the range of temperature below 30 K, where it appears that tunnelling becomes increasingly important, are much less well defined. The STH decay process in this region was then examined in more detail [25] on AgCl:Cu and AgCl:Pd crystals. The experiments proved difficult to interpret because of several factors: (a) the decay kinetics at low temperature, where there is presumably a mixture of hopping and ballistic trajectory, were complex; (b) there was a large variation among the specimens, perhaps because of dislocations introduced by thermal strain of the very soft AgCl, and to which the tunnelling is expected to be sensitive; (c) the range of study could not be extended below 10 K because of a sharp drop in the decay rate, which appears to be the effect of traps a few meV in depth.…”

Section: Migration Of the Self-trapped Holementioning

confidence: 99%

Dynamics of self-trapped hole processes in AgCl

Slifkin

2001

J. Phys.: Condens. Matter

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A set of phenomena involving the self-trapped hole (STH) in AgCl have been studied in crystals doped with hole sources, traps for holes and electrons and providers of cation vacancies. An energy barrier was demonstrated in the self-trapping process; its energy was related to appropriate phonon energies, and tunnelling appeared in the temperature range predicted by Mott and Stoneham. Migration of the STH can occur either by phonon-assisted hopping or by tunnelling. From the temperature dependences, one obtains the activation energy (0.062 eV), the trap depth (0.12 eV) and the temperature exponent for quantum migration (1.3). The structures and energetics of two centres involving an STH bound to a vacancy have been deduced. Also, it was shown that low-temperature capture of a hole by substitutional Fe2+ causes production of a Frenkel pair, as well as ultimately leading to formation of the (interstitial Fe3+) - (multivacancy) defect that was first characterized by Hayes et al.

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Section: Migration Of the Self-trapped Holementioning

confidence: 99%