Superconducting phase diagram in Ca2−xNaxCuO2Cl2−yBry

✍ Scribed by Yuji Zenitani; Teruhiko Suzuki; Hirokazu Kawashima; Jun Akimitsu

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 651 KB
• Volume: 419
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.12.002

✦ Synopsis

Ca 2 CuO 2 Cl 2Ày Br y (0 6 y 6 2) has the K 2 NiF 4 -type structure with halogens (Cl and Br) at their apical sites and superconductivity can be achieved by substituting Ca 2+ sites with Na + . We have succeeded in making a comprehensive superconducting phase diagram of Ca 2Àx Na x CuO 2 Cl 2Ày Br y by focusing on special attention to the relationship between the superconductivity and the Cu and Cl/Br distance in Ca 2Àx Na x CuO 2 Cl 2Ày Br y . We were successful in continuously changing the length of c-axis, which is closely related to the distance between the apical site and the CuO 2 plane, or the distance between Cu and Cl/Br. Without changing the bonding distance between Cu and O in the CuO 2 plane. This is the first example of this kind of control in cuprate superconductors.