Abstract
Abstract Both the Meissner-signal (flux expulsion on cooling through Tc) and the shielding signal (obtained by turning on a field in the superconducting state) have been observed in deuterated single crystals for fields oriented both along and normal to the chain axis. A possible isotope effect on Tc is discussed. We find complete diamagnetism in normal fields and incomplete (∼ 40 %) diamagnetism in parallel fields. A dramatic drop of the Meissner-effect in parallel fields well below Hc1 is observed and not yet well explained.
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