Magnetic method for Hc2 measurement in pulsed fields: Application to high Tc superconductors

✍ Scribed by F Bolzoni

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 379 KB
• Volume: 29
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(89)90138-0

✦ Synopsis

Hc2 measurement in high pulsed fields, of type II superconductors is described. A special pick-up is used to measure the induced dM/dt while, simultaneously, an operational amplifier gives the derivative of the differential susceptibility (DDS). The double peak signal obtained decreases with increasing field and temperature and disappears at H = Hc2 or T -----T . The shape of this peak is also derived from the analysis of the hysteresis loop of type II harc~ superconductor in high field, close to Hc2. The method was used to measure He2 of YBa2Cu30 ~ samples prepared in different ways. All samples give the same Hc2 value, Hc2 = 15.6 T at 78 K. The results obtained are discussed and compared with those given in the literature.