A 94 K Hg-based superconductor with a “1212” structure Hg0.5Bi0.5Sr2Ca1−xRxCu2O6+δ (R = Nd, Y, Pr)

✍ Scribed by D. Pelloquin; M. Hervieu; C. Michel; G. Van Tendeloo; A. Maignan; B. Raveau

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 453 KB
• Volume: 216
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90069-3

✦ Synopsis

A new mercury-bismuth-based cuprate, Hgo.sBi0.sSr2Cat _xNdxCu206+6 has been synthesized for x ranging from 0.35 to 1. The high-resolution electron microscopy and the X-ray diffraction analyses give evidence for a 1212-type structure, without any ordering between Hg and Bi. For 0.35 < x < 0.5, the samples are superconducting with a Tc oo~et of 94 K and a diamagnetic volume fraction of 32%. Annealings at low temperatures under different atmospheres do not modify the superconducting behavior. Substitutions of Pr and Y for Nd allow isotypic oxides to be synthesized with similar superconducting properties.