Pseudogap in CdBa2Cu3O7?? HTSC material

Long-lived minima are detected at Tmin1 = 275 K and Tmin2 = 252 K in the rho (T) curve of polycrystalline CdBa2Cu3O7- delta , which has a superconducting transition at 86.8 K. It is shown that the excess conductivity Delta sigma (T) near Tmin obeys the classical Aslamazov-Larkin fluctuation theory....

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2013-01, Vol.39 (6)
Main Authors: Aliev, V M, Ragimov, S S, Selim-zade, R I
Format: Article
Language:English
Subjects:
Coherence
Constants
COPPER OXIDE
ELECTRICAL CONDUCTIVITY
Fluctuation
Low temperature physics
MATHEMATICAL ANALYSIS
Minima
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Temperature dependence
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Summary:Long-lived minima are detected at Tmin1 = 275 K and Tmin2 = 252 K in the rho (T) curve of polycrystalline CdBa2Cu3O7- delta , which has a superconducting transition at 86.8 K. It is shown that the excess conductivity Delta sigma (T) near Tmin obeys the classical Aslamazov-Larkin fluctuation theory. This suggests that fluctuation Cooper pairs may develop in CdBa2Cu3O7- delta at T >> Tc. The experimental data are used to calculate the coherence length xi c(0), the 2D-3D crossover temperature T0, and the interplanar pairing constants. The magnitude and temperature dependence of the pseudogap for a sample without the minima are found to be typical of cuprate HTSC materials.
ISSN:1063-777X
DOI:10.1063/1.4811334