The critical current density of Tl-1212 and 1223-based superconductors

Journal article

We have carried out systematic investigations of the critical current densities (Jc) in a series of unoriented granular superconductors of the (Tl1-xBix)(Sr1-yBay) 2Ca2Cu3Ox (1212) and (Tl1-xPbx)Ba2CaCu2Ox (1223) phases, with Tc varying from 88 to 115 K. The most striking result is that the critical current density of the best sample, (Tl0.78Bi0.22)(Sr0.8Ba0.2) 2Ca2Cu3Ox, exceeds 105 A/cm2 at T= 100 K, H = 0 and 2 × 103 A/cm2 at T = 100 K, 5 kOe. Moreover, at low enough field and temperature (H ≤ 20 kOe and T ≤ 80 K) some of the (1223) materials exhibit very much the same behavior as YBa2Cu3O7-δ but have larger current carrying capacities at higher fields and temperatures (T ≥ 77 K and H ≥ 50 kOe). The comparison of the pinning properties of the various samples suggests that Jc is strongly enhanced by BaBiO3 inclusions present in some of the investigated 1223 phase. © 1997 Elsevier Science B.V.

Authors: Senoussi, S; Kilic, A; Kilic, H; Moore, J; Grovenor, C

• Publication status: Published
• Journal: PHYSICA C
• Volume: 280
• Issue: 3
• Pages: 137-141
• Publication date: 1997-07-01
• DOI: 10.1016/S0921-4534(97)00166-4
• ISSN: 0921-4534
• Language: English
• Keywords: magnetic irreversibilities; critical current density; Tl-based granular superconductors