Superconducting and magnetic properties of materials with varying clustering in YBA2(CU1-xMx)3Oy with M = Fe, Co, Ni

✍ Scribed by Donggeun Ko; Ju Yeol Lee; James O'Brien; H. Oesterreicher; R.D. Taylor

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 347 KB
• Volume: 1
• Category: Article
• ISSN: 0964-1807
• DOI: 10.1016/0964-1807(93)90417-z

✦ Synopsis

We present structural, magnetic and superconducting properties of conventionally, and reductively prepared equilibrium states of YBa,(Cu,_,M,)sO, with M = Fe, Co, Ni. Depending on preparation conditions, varying clustering tendencies for M on Cu(l) are found. A highly ordered cluster state :U) manifests itself in relatively high T, and strong orthorhombicities amongst others. This ha: to do with the partial condensation of M into cluster domain walls. Mode and conditions for this clustering are different for different M. As an example, maximum values of T, at a given x are found at lower annealing temperatures for M = Co compared to Fe both, experimentally and on a local thermodynamic model. Comparisons of this model with data from Mossbauer spectroscopy are drawn. The clustered M = Fe materials show an increase in critical currents through flux pinning on the Fe clusters, indicating technological potential.