Research

Tokyo Tech News

Discovery of a Perovskite-type oxide superconductor with a new ordered structure

October 27, 2014

Summary

A research group including Professor Nobuhiro Kumada and Professor Isao Tanaka of the University of Yamanashi's Center for Crystal Science and Technology, Professor Masaki Azuma of the Materials and Structural Laboratory at the Tokyo Institute of Technology, and Professor Yoshihiro Kuroiwa of the Department of Physical Science at Hiroshima University discovered a new Bismuth oxide superconductor (Na0.25K0.45)(Ba1.00)3(Bi1.00)4O12. This superconductor has an A-site ordered double Perovskite-type structure on which Barium, Sodium and Potassium are regularly arranged, and offers a new pointer for investigating high-temperature superconductors and clarifying their mechanisms.

The results of this research were published in the online version of the German scientific journal "Angewandte Chemie International Edition" on February 27 (Japan time).

Fig. 1 The magnetic susceptibility curve of the newly synthesized (Na0.25K0.45)(Ba1.00)3(Bi1.00)4O12. Superconducting transition can be confirmed at 27 K

Fig. 1
The magnetic susceptibility curve of the newly synthesized(Na0.25K0.45)(Ba1.00)3(Bi1.00)4O12.Superconducting transition can be confirmed at 27 K.

Fig. 2 A schematic diagram of the Perovskite-type structure and A-site ordered double Perovskite-type structure. Perovskite has one kind of A-site, but in the A-site ordered double Perovskite-type structure there are two kinds: A'site and A"site, so it has a doubled unit cell. In the superconductor discovered in the current research, the A'site is occupied by Sodium and Potassium, while the A"site is occupied by Barium.

Fig. 2
A schematic diagram of the Perovskite-type structure and A-site ordered double Perovskite-type structure. Perovskite has one kind of A-site, but in the A-site ordered double Perovskite-type structure there are two kinds: A'site and A"site, so it has a doubled unit cell. In the superconductor discovered in the current research, the A'site is occupied by Sodium and Potassium, while the A"site is occupied by Barium.

Reference

Authors:
Mirza H. K. Rubel et al.
Title of original paper:
Superconducting double perovskite bismuth oxide (Na0.25K0.45)(Ba1.00)3(Bi1.00)4O12 prepared by a low-temperature hydrothermal reaction
Journal:
Angewandte Chemie International Edition
DOI:

Further information
Professor Masaki Azuma
Materials & Structures Laboratory
Tel: +81-45-924-5315, Fax: -81-45-924-5318
Email: mazuma@msl.titech.ac.jp