Preparation and Properties of Low‐Calcium–Content Superconductive Thin Films in Bismuth Systems

Keizou Tsukamoto, Hiromasa Shimojima, Mamoru Ishii, Naoya Enomoto, Chitake Yamagishi

Research output: Contribution to journalArticle

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Abstract

Superconductive, polycrystalline thin films from Bi systems with low Ca content in relation to the high‐Tc phase and with various Bi(Pb) contents were obtained by two‐step annealing of the deposited amorphous films prepared by rf magnetron sputtering. The obtained films, A, B, and C, exhibited a high Tc (Tc > 100 K) for a wide range of secondary annealing temperatures. The critical current densities of these films at 77.3 K in zero magnetic field were sensitive to the secondary annealing temperature. The highest critical current densities of the films were 27000, 3900, and 5500 A/cm2 for films A, B, and C, respectively. Film B exhibited large decreases in critical current density under an applied magnetic field. The grain boundaries of this film, which were composed of PbO, CuO, and Bi2O3, apparently acted as weak links in the superconductor materials.

Original languageEnglish
Pages (from-to)1031-1039
Number of pages9
JournalJournal of the American Ceramic Society
Volume76
Issue number4
DOIs
Publication statusPublished - Jan 1 1993

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Bismuth
bismuth
Thin films
annealing
density current
Annealing
Magnetic fields
Amorphous films
magnetic field
Magnetron sputtering
Superconducting materials
Grain boundaries
grain boundary
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

Preparation and Properties of Low‐Calcium–Content Superconductive Thin Films in Bismuth Systems. / Tsukamoto, Keizou; Shimojima, Hiromasa; Ishii, Mamoru; Enomoto, Naoya; Yamagishi, Chitake.

In: Journal of the American Ceramic Society, Vol. 76, No. 4, 01.01.1993, p. 1031-1039.

Research output: Contribution to journalArticle

Tsukamoto, Keizou ; Shimojima, Hiromasa ; Ishii, Mamoru ; Enomoto, Naoya ; Yamagishi, Chitake. / Preparation and Properties of Low‐Calcium–Content Superconductive Thin Films in Bismuth Systems. In: Journal of the American Ceramic Society. 1993 ; Vol. 76, No. 4. pp. 1031-1039.
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