New Series of High Tc Superconductors, GaSr2Can-1CunO2n+3 (n=3; Tc=70 K, n=4; Tc=107 K) Prepared at High Pressure
- 1 October 1994
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 33 (10A) , L1399-1402
- https://doi.org/10.1143/jjap.33.l1399
Abstract
A new series of superconductors, GaSr2Ca n -1Cu n O2 n +3 ( n=3, 4), were prepared under a high pressure of 6 GPa at 1250°C. The n=4 member becomes superconducting below 107 K while the n=3 one below 70 K. From an analogy with the structure of the Ga-1212 phase, their X-ray patterns were indexed assuming orthorhombic lattices with the space group of I2 mb( Ima2, No. 46): a=5.454(1), b=5.391(1) and c=29.371(6) Å for the n=3 member and a=5.462(4), b=5.417(4) and c=35.78(5) Å for the n=4 one. They have structures closely related to those of Tl (or Hg)-1223 and 1234 phases.Keywords
This publication has 7 references indexed in Scilit:
- Identification of 70 K superconducting phase in the Y-Ca-Sr-Ga-Cu-O systemPhysica C: Superconductivity and its Applications, 1994
- High-pressure synthesis of Y1-xCaxSr2GaCu2O7±δ (0⩽x⩽1.0)Physica C: Superconductivity and its Applications, 1994
- Superconductivity Above 70K in GaSr2(Y1−xCax)Cu2OyPublished by Springer Nature ,1993
- Neutron powder diffraction study of the crystal structure of YSr2CoCu2O7 and Y1−xCaxSr2CoCu2O7Physica C: Superconductivity and its Applications, 1992
- New family of superconducting copper oxides: GaSr2Ln1−xCaxCu2O7Physica C: Superconductivity and its Applications, 1992
- Synthesis and structure of a new family of cuprate superconductors: LnSr2Cu2GaO7Chemistry of Materials, 1991
- The crystal structure of RESr2GaCu2O7Journal de Physique I, 1991