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VOLUME 27 (1978) | ISSUE 1 | PAGE 37
Anomalous diamagnetism (high-temperature Meissner effect?) in the compound CuCI
Repeated transitions of CuCl from a weak-diamagnetism state with χ~ — (10~5-10-6) into a diamagnetic susceptibility close to χ= — 1 (the Meissner effect), accompanied in individual cases by an abrupt increase (by several orders of magnitude) of the electric conductivity, was observed when polycrystalline CuCl samples under a hydrostatic pressure P~ 5 kbar were cooled at a sufficiently rapid rate (>20 deg/min) from a temperature ~170 K. At temperatures below —100 K, the CuCl goes over into a stationary or quasistationary state with χ~-1, which is preserved in stable fashion in this temperature region for at least several hours.