Superconducting-state thermodynamic parameters of HgBa2Can-1CunOy (n=1, 2, and 3)

✍ Scribed by R. Puźniak; K. Isawa; R. Usami; H. Yamauchi

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 689 KB
• Volume: 233
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)00582-6

✦ Synopsis

Magnetic measurements have been performed on magnetically aligned, nearly single-phase samples of HgBa2CuO4+~, Hg-Ba2CaCu206+6, and HgBa2Ca2Cu308+6. The basic thermodynamic parameters describing the superconducting state, such as the penetration depth and the coherence length in the a-b-plane, and the lower and upper critical fields along the c-axis, were determined. A systematic decrease of the penetration depth in the a-b-plane, a decrease of Ginzburg-Landau parameter, and an increase in the thermodynamic critical field with increasing number of CuO2 planes in the unit cell are revealed. The values obtained for the Ginzburg-Landau parameter and the thermodynamic critical field for the Hg-based superconductors are compared with those for YBa2Cu3OT_~. The low position of the irreversibility lines for the Hg-based superconductors is attributable to relatively small values of the thermodynamic critical field.