Antiferromagnetic order in Ca2CuO2Cl2, Sr2CuO2Cl2 and Sr2CuO3+x

✍ Scribed by D. Hechel; I. Felner

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 182 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)92026-5

✦ Synopsis

The magnetic order in the tetragonal M2CuO2CI2, M=Ca, Sr and in Sr2CuO3+ x compounds was studied by using Mossbauer spectroscopy of 0.5% ~ IFe-doped samples. These compounds crystallize in a K2NiF 4 -type tetragonal structure, isestructural to La2.xSrxCuO 4 superconductors. In this structure, one crystallographic site exists for copper atoms, which form CuO 2 planes. Sr2CuO 3 prepared under ambient pressure has an orthorhombic structure, while the tetragnnal Sr2CuO3+ x is obtained when prepared under high oxygen pressure. Both copperoxychlorides are antiferromagnetically ordered with T N ~ 260K, very similar to T N in La2CuO 4 or Nd2CuO 4. The strontium-cuprates are magnetically ordered at 4.2K with T N below 10K.