Flux pinning and the irreversibility line in the grain aligned HgBa2Ca2Cu3Oy superconductor

✍ Scribed by G.C. Kim; Y.C. Kim

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 530 KB
• Volume: 101
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(96)00511-x

✦ Synopsis

From magnetization

studies for the grain aligned HgBa2CazCu30, superconductor the temperature variation of critical current density J,(T) values was characterized by an exponential decay of the form J, a exp (-T/T,).

Flux pinning was significantly greater with the peak F P, ,,,(T) shifted to higher magnetic field as decreasing temperature. For irreversibility line Hi,,(T), the data could be fitted with the power law of T-" with m = 4.6 at T < 80 K and the scaling law Of Hi,, a: (1 -TIT,)" with n = 1.7 at T > 80 K. Thus, we obtained the result that the pinning potential U(H ) a H -1i4.6 at T < 80 K and FP, max 0: Hfr with the exponent (Y = 0.8. From flux-pinning diagram of the vortex state, we found that the SVP (single vortex pinning) regime is extended up to 60K.