Inhomogeneity Induced Conductivity Fluctuation in YBa<subscript>2</subscript>Cu<subscript>3</subscript>O<subscript>7−y</subscript>/Cr<subscript>2</subscript>O<subscript>3</subscript> Composite.
In: Journal of Superconductivity & Novel Magnetism, Jg. 26 (2013-10-01), Heft 10, S. 3017-3025
Online
academicJournal
Zugriff:
Dimensional fluctuations of superconducting order parameters in YBa 2Cu 3O 7−y+ xCr 2O 3 ( x=0.0, 2.3, 4.4, and 6.1 wt.%) has been analyzed. SEM micrographs reveal the reduced grain size with the incorporation of magnetic Cr 2O 3 particles in the YBCO matrix. XRD graphs show the unchanged orthorhombic structure and improved oxygen ordering in the composite samples. With the increase of Cr 2O 3 wt.%, it is found that the superconducting transition temperatures determined from standard four-probe method decreases gradually. Excess conductivity fluctuation analysis using Aslamazov–Larkin model fitting reveals transition of two dominant regions (2D and 3D) above Tc. 2D to 3D crossover temperature, i.e., Lawerence–Doniach temperature that demarcates dimensional nature of fluctuation inside the grains is influenced by Cr 2O 3 incorporation in YBCO matrix. The decrease in Lawerence–Doniach temperature in the mean field region has been observed as a consequent dominance of the 3D region with an increase in wt.% of Cr 2O 3 in the composite. [ABSTRACT FROM AUTHOR]
Titel: |
Inhomogeneity Induced Conductivity Fluctuation in YBa<subscript>2</subscript>Cu<subscript>3</subscript>O<subscript>7−y</subscript>/Cr<subscript>2</subscript>O<subscript>3</subscript> Composite.
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Autor/in / Beteiligte Person: | Sahoo, M. ; Behera, D. |
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Zeitschrift: | Journal of Superconductivity & Novel Magnetism, Jg. 26 (2013-10-01), Heft 10, S. 3017-3025 |
Veröffentlichung: | 2013 |
Medientyp: | academicJournal |
ISSN: | 1557-1939 (print) |
DOI: | 10.1007/s10948-013-2116-5 |
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