NDLI: How Grain-Boundaries Influence the Intergranular Critical Current Density of Cu$_{1−x }$Tl$_{ x }$Ba$_{2}$Ca$_{3}$Cu$_{4}$O$

Content Provider	Springer Nature Link
Author	Khan, Nawazish A. Mumtaz, M.
Copyright Year	2008
Abstract	The insulating and metallic behavior of the grain-boundary weak links has been studied in thallium rich and the samples with small amount of thallium in the charge reservoir layer of Cu$_{1−x }$Tl$_{ x }$Ba$_{2}$Ca$_{3}$Cu$_{4}$O$_{12−δ }$ superconductor thin films. The influence of the nature of grain boundaries on the inter-granular critical current density (J $_{c}$) has also been investigated. From the power law dependence of H $_{ac}$∼(1−T $_{p}$/T $_{c}$)$^{ n }$, it was observed that n=1 gives a best fit for the J $_{c}$ of thallium rich samples and n=2 provides a best fit for the J $_{c}$ of the samples with small amount of thallium. The polycrystalline thin film samples showing the power law dependence of J $_{c}$ as n=1 make superconductor-insulator-superconductor (SIS) type while the samples with n=2 follow superconductor-normal metal-superconductor (SNS) types of Josephson junctions. The insulating grain boundaries decrease the inter-granular Josephson coupling and hence the transport properties are suppressed.
Starting Page	1221
Ending Page	1229
Page Count	9
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	151
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2008-02-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thin films Cu$_{1−x }$Tl$_{ x }$Ba$_{2}$Ca$_{3}$Cu$_{4}$O$_{12−δ }$ superconductors High J $_{c}$ Grain boundaries Cuprate superconductors Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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