Hall anomaly in CNT-doped Y-123 high temperature superconductor

✍ Scribed by S. Dadras; N. Manivannan; K.H. Kim; V. Daadmehr; M. Akhavan

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 320 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2010.01.041

✦ Synopsis

In order to study the Hall effect in pure and CNT-doped Y-123 polycrystalline samples, we have measured the longitudinal and transverse voltages at different magnetic field (0 À 9 T) in the normal and vortex states. In the normal state, the Hall coefficient is positive and decreases with increasing temperature, and can be approximately fitted to R H = a + bT À1 . We have found a sign reversal in the pure sample for the magnetic field of about 3 T, and double sign reversal of the Hall coefficient in the 0.7 wt% CNT-doped sample at about 3 and 5 T. The Hall resistivity in our samples depends on the pinning.