ISSN:
1434-6036
Keywords:
PACS. 74.25.-q General properties; correlations between physical properties in normal and superconducting states - 74.40.+k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) - 75.40.-s Critical-point effects, specific heats, short-range order
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: Using a new starting material of Ba2Cu3O5 and a three step heat treatment, single phase Tl2Ca1Ba2Cu2O8 high- superconducting samples have been prepared, possessing the onset- and critical temperatures K and K. The morphology dependent value of is 17 Oe, 8 Oe and 5 Oe at 77 K in the case of bulk, crushed and powdered materials, respectively. The a.c. susceptibility, r.f. susceptibility and microwave absorption properties show a significant dependence on the particle size with a sharp change in the interval between 750 μm and 1200 μm. These experiments provide characteristic parameters for intergrain material (treated as 3D Josephson network) as mm, Oe and A/cm2 at 77 K. The data are controlled by modulated microwave absorption measurements. The results obtained can be explained well both by the finite size junction model and cavity mode absorption model. The Josephson network is determined unambiguously by metallic S-N-S weak links.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050782
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