A1 Refereed original research article in a scientific journal

Size-dependent properties of YBa2Cu3O6+x nanopowder




AuthorsPaturi P, Raittila J, Huhtinen H, Huhtala VP, Laiho R

PublisherIOP PUBLISHING LTD

Publication year2003

Journal:Journal of Physics: Condensed Matter

Journal name in sourceJOURNAL OF PHYSICS-CONDENSED MATTER

Journal acronymJ PHYS-CONDENS MAT

Article numberPII S0953-8984(03)57459-8

Volume15

Issue12

First page 2103

Last page2114

Number of pages12

ISSN0953-8984

DOIhttps://doi.org/10.1088/0953-8984/15/12/327


Abstract
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.



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