Particle size dependence of zero-field microwave absorption in powdered Bi - Sr - Ca - Cu - O superconductors

Topacli, C.; Harris, E. A.

doi:10.1088/0953-8984/9/6/013

Cited by 3 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption curves of the L and M samples are similar to those of the O and S samples, respectively, and for clarity they are not shown in figure 4. These data are similar to those of, for example, [13,22] and differ from those measured without modulation [15,23]. The difference is due to dissipation by the vortices and shielding currents created by the modulation field, which is naturally absent in non-modulated data.…”

Section: Magnetic and Microwave Properties Of The Segregated Samplessupporting

confidence: 73%

Size-dependent properties of YBa₂Cu₃O_6 xnanopowder

Paturi

Raittila

Huhtinen

et al. 2003

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

YBa2Cu3O6+x nanopowder, prepared by the citrate sol–gel method, is segregated by sedimentation in ethanol into three size groups with average particle heights of 0.7, 1.6 and 2.3 nm. The structural properties and composition of the powders, investigated by x-ray diffraction, atomic force microscopy, Auger electron spectroscopy and EPR-spectroscopy, show no clear differences, except the size. According to investigations by magnetometry and by non-resonant microwave absorption the as-prepared powder contains weak links which, however, disappear during the segregation. The magnetic susceptibility of the samples decreases with the decreasing particle size, in agreement with the susceptibility values calculated from the London equations for cylindrical particles smaller than the London penetration depth. In all three size groups the critical temperature of superconductivity is 92 K.

show abstract