Interpretation and consequences of Meyer-Neldel rule for conductivity of phase change alloys

Measurements of conductivity as a function of temperature were performed on a large number of memory cells of a GeSbTe phase change memory alloy, in both the set and reset states. Conductivity obeys the Meyer–Neldel rule in both states, with the same Meyer–Neldel, or isokinetic, temperature, but wit...

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Bibliographic Details
Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2010-03, Vol.207 (3), p.627-630
Main Authors: Savransky, S. D., Yelon, A.
Format: Article
Language:English
Subjects:
64.70.dg
71.38.−k
73.61.Jc
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Electronic transport in condensed matter
Exact sciences and technology
Low-field transport and mobility
piezoresistance
Physics
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Summary:Measurements of conductivity as a function of temperature were performed on a large number of memory cells of a GeSbTe phase change memory alloy, in both the set and reset states. Conductivity obeys the Meyer–Neldel rule in both states, with the same Meyer–Neldel, or isokinetic, temperature, but with conductivity prefactors about six orders of magnitude larger in the set than in the reset state. These observations are interpreted in terms of the multiexcitation entropy model, and conduction mechanisms are suggested. Their effect on the expected behavior of memories is considered.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.200982663