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

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliConference articleScientificvertaisarvioitu

15 Sitaatiot (Scopus)

Abstrakti

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.

AlkuperäiskieliEnglanti
Sivut46-51
Sivumäärä6
JulkaisuPHYSICA C: SUPERCONDUCTIVITY AND ITS APPLICATIONS
Vuosikerta338
Numero1
DOI - pysyväislinkit
TilaJulkaistu - 1 elokuuta 2000
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational 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, Japani
Kesto: 15 lokakuuta 199916 lokakuuta 1999

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