Superconductivity, structure and resistivity in HgBa2Ca2Cu3O8+δ

✍ Scribed by Z.J. Huang; R.L. Meng; X.D. Qiu; Y.Y. Sun; J. Kulik; Y.Y. Xue; C.W. Chu

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 427 KB
• Volume: 217
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90786-p

✦ Synopsis

Samples of HgBa2Ca2Cu3Os.6 were successfully prepared and investigated. By examining the X-ray diffraction, mission electron microscopy, magnetization and resistivity, we found that HgBa2CaaCusOs+8 possesses an orthorhombic structure with lattice parameters o--5.451(2) A, b=5.432(2) ,~ and c= 15.826(7) A and a sharp superconducting transition (mai~etically determined) at ~ 112 K as-synthesized and as high as ~ 135 K after oxygenation. The resistivity vanishes below 134 K, the highest reported for any superconductor to date. No superstructures of the types previously reported in the > 130 K samples were detected in this study. A linear T-dependent resistivity which is interpolated to zero at 0 K was also observed above ~ 240 K. Below ~ 240 K, deviation from such a linearity appears, which may be attributable to the fluctuation or spin-scattering effect, assuming that the behavior is intrinsic to H~a2Ca2Cu3Ot+a.