Scaling features in M-H loops of YBa2Cu3O7-x single crystal

✍ Scribed by M. Oussena; S. Porter; P.A.J. de Groot; A. Marshall; J.S. Abell

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 141 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91441-9

✦ Synopsis

Magnetic hysteresis curves in YBa2Cu307 x single crystal are scaled by dividing the magnetic field H and the magnetisation M by the full penetration field H v and the associated magnetisation My. The scaling parameters, H v and Mv are determined experimentally as the merging point between the virgin magnetic curve and the M-H loop envelope. For magnetic fields higher than Hv, the M-H loops, once scaled, lie on a unique envelope, independent of temperature up to the irreversibility line. This result suggests that below the irreversibility line there is no evidence of any transition between different types of pinning for H > Hp.

Although the magnetic properties of YBa2Cu307 (YBCO) single crystals have been widely investigated since the early discovery of the superconducting oxides[i-2], their behaviour with magnetic field and temperature remains to be understood. The shape of the dc magnetic hysteresis loops changes drastically with temperature leading to suggest different types of pinning regimes.