Water-containing phases derived from '02(n - 1)n' superconductors. II. Derivative of the Sr2Ca2Cu3O8±δ (0(Sr)223) phase

H. Yamauchi*, M. Karppinen, T. Hosomi, H. Suematsu

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

15 Citations (Scopus)

Abstract

A novel phase has been derived from the '0(Sr)223' phase, i.e. Sr2Ca2Cu3O8+δ with Tc = 111 K, which was synthesized by a high-pressure technique. The formation of the derivative phase was made through exposing the as-'high-pressure'-synthesized sample to air for a long period, i.e. 10-100 days. During the exposure, water molecules, and also possibly other light molecules or ions, were believed to be incorporated into the parent 0(Sr)223 structure to expand its 'zero' charge-reservoir block by approx. 3 angstrom. Consequently, due to the phase transition, the original unit cell of body-centered (I) symmetry was expanded along the c-axis by approx. 6 angstrom, i.e. from 27.2 to 33.2 angstrom. SQUID measurements revealed superconductivity, but no definite Tc value for the new derivative phase could be extracted from the data because of the multiphase character of the samples prepared. The possible driving force for the phase transition is discussed.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalPHYSICA C: SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume338
Issue number1
DOIs
Publication statusPublished - 1 Aug 2000
MoE publication typeA4 Conference publication
EventInternational Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials & 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V) - Yokohama, Japan
Duration: 15 Oct 199916 Oct 1999

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