A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Size-dependent properties of YBa2Cu3O6+x nanopowder
Tekijät: Paturi P, Raittila J, Huhtinen H, Huhtala VP, Laiho R
Kustantaja: IOP PUBLISHING LTD
Julkaisuvuosi: 2003
Lehti:: Journal of Physics: Condensed Matter
Tietokannassa oleva lehden nimi: JOURNAL OF PHYSICS-CONDENSED MATTER
Lehden akronyymi: J PHYS-CONDENS MAT
Vuosikerta: 15
Numero: 12
Aloitussivu: 2103
Lopetussivu: 2114
Sivujen määrä: 12
ISSN: 0953-8984
DOI: https://doi.org/10.1088/0953-8984/15/12/327
Tiivistelmä
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.
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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