Superconducting properties and structural stability of Bi2Sr2CaCu2O8+δ compound prepared by electrochemical reduction in protogenic electrolyte

Motohide Matsuda, Hideki Tamada, Kimihiro Yamashita, Takao Umegaki, Michihiro Miyake

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Abstract

Superconducting Bi2Sr2CaCu2O8+δ (Bi-2212) compound was eleclrochemically reduced in a protogenic electrolyte of benzoic acid dissolved in acetone. The critical temperatures (Tc) of the reduced Bi-2212 were enhanced from 75 K up to ∼90 K, which were reportedly the highest value of Bi-2212 superconductor. In spite of the enhancement of Tc, a diamagnetism of Bi-2212 was weakened after the reduction. This phenomenon was discussed in terms of the flux penetration depth. The electrochemically reduced Bi-2212 had a different structural stability from a partly oxygen-removed Bi-2212 which was prepared by annealing in reducing atmospheres. These results are attributable to injection of protons from the benzoic acid into the Bi-2212 structure.

Original languageEnglish
Pages (from-to)3214-3218
Number of pages5
JournalJournal of Materials Research
Volume12
Issue number12
Publication statusPublished - Dec 1997

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ASJC Scopus subject areas

  • Materials Science(all)

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