✦ LIBER ✦

Crystal structure and electromagnetic properties of GdSr2CoCu2O7

✍ Scribed by L.T. Yang; J.K. Liang; Q.L. Liu; F.S. Liu; J. Luo; G.H. Rao

Publisher: Elsevier Science
Year: 2004
Tongue: English
Weight: 347 KB
Volume: 349
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2003.12.019

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✦ Synopsis

The crystal structure of the new compound GdSr 2 CoCu 2 O 7 has been studied by powder X-ray diffraction. This compound crystallizes in space group Ima2 with lattice parameters a ¼ 22:7837ð4Þ ( A, b ¼ 5:4773ð1Þ ( A and c ¼ 5:4383ð1Þ ( A and 4 formula units per unit cell. Like the high-T c superconductor GdBa 2 Cu 3 O 7 (Ln-123) the structure of GdSr 2 CoCu 2 O 7 contains double layers of CuO 5 -pyramids separated by trivalent rare earth ions. The rows of CuO 4 square planar groups of Ln-123 superconductors are replaced by rows of corner-sharing CoO 4 tetrahedra. The role of Ba to fill the large voids in Ln-123 is played by Sr in this compound. Magnetization measurements indicate that the magnetic susceptibility w changes with temperature in a Curie-type manner.

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