Paramagnetic Meissner effect of highT
c superconductors II |
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| Authors: | Yusheng HE C M Muirhead W F Vinen |
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| Institution: | (1) Cryogenic Laboratory, Chinese Academy of Sciences, 100080 Beijing, China;(2) School of Physics & Space Research, University of Birmingham, B152TT Birmingham, UK |
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| Abstract: | A range of powdered Bi:2 212 samples exhibiting the paramagnetic Meissner effect (PME) are systematically examined. Interpretation
of the results is made in terms of a phenomenological model in which there is a concentration within the material of small
local moments that can be polarized during a field cooling. Information about the magnitudes of these local m0oments and their
distribution are deduced. Relations between the local moments and the particle sizes, the weak link, oxygen content and the
interactions between the local moments are also discussed. Comparison of the results from small particles and bulk samples
shows that conclusions obtained from small particle experiments are reliable and universal. |
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| Keywords: | highT c superconductivity paramagnetic Meissner effect small particles local moment phenomenological model |
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