Journal
PHYSICA B-CONDENSED MATTER
Volume 328, Issue 1-2, Pages 6-9Publisher
ELSEVIER
DOI: 10.1016/S0921-4526(02)01797-0
Keywords
superconductivity; intercalation; layer-structured nitrides; electron doping
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The layer-structured metal nitride chlorides, beta-MNCl (M = Zr, Hf) can be electron doped by intercalation of alkali metals between the layers. Upon intercalation, the crystals changed into superconductors with relatively high transition temperatures (T-c's). The highest T-c was observed at 25.5 K for the Li and tetrahydrofuran (THF) co-intercalated beta-HfNCl. A new electron-doping method has been developed by deintercalation of a part of chlorine atoms from the layers. The chlorine deficient compound beta-NINCl1-x showed superconductivity very similar to those of the alkali metal intercalated samples. (C) 2002 Published by Elsevier Science B.V.
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