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A comparative study of thermoelectric properties in (Pr,Y)Ba2Cu3O7and PrBa2Cu3O7-Ag percolative systems

✍ Scribed by Mori, Natsuki ;Okano, Hiroyuki ;Furuya, Akio

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
511 KB
Volume
203
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

Measurements of the temperature‐dependent thermoelectric power S (T ) and resistivity ρ (T ) were performed to characterize two kinds of polycrystalline systems (Pr~1–x~ Y~x~ )Ba~2~Cu~3~O~7~ and Ag‐doped PrBa~2~Cu~3~O~7~, each of which exhibits percolative behaviour at a certain doping level. At room temperature, Jonker plots of the thermoelectric power against logarithm of the conductivity in both systems show a similar tendency that two different fitting lines are intercrossed at the percolation thresholds. The ρ (T ) behaviour below 100 K in each system with low dopant content obeys the variable‐range‐hopping conduction. Variations of S (T ) in both systems could be reconciled with the Boson–Fermion theory based on the resonating‐valence‐bond model with reasonable dependences of fitting parameters upon doping. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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