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Thermal boundary between normal conductivity and fluctuation superconductivity in YBa2Cu3O7 − δ

✍ Scribed by N.M. Vladimirova; V.M. Drobin; N.V. Vuong

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
108 KB
Volume
23
Category
Article
ISSN
0749-6036

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✦ Synopsis

The absence of a linear behaviour of the dependence of the resistance R(T ) over a temperature interval 77-300 K was observed for ceramic superconductors YBa 2 Cu 3 O 7-δ and thick polycrystalline films of the same composition with the addition of silver. A comparative analysis of the excess conductivity for HTSC and metal samples, characterizing the deviation R(T ) from a linear dependence, allows one to determine the onset temperature of fluctuation superconductivity: within 105-110 K. The analysis of fluctuation superconductivity is performed using the Aslamazov-Larkin model. A smooth transition from the one-dimensional to the two-and three-dimensional nature of superconducting fluctuations in the order parameter was observed for ceramic samples as the temperature decreased.

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