Macroscopic magnetic properties of high Tc epitaxial Y1Ba2Cu3Ox thin films

✍ Scribed by D.C. Bullock; T.J. Folkerts; P. Klavins; R.N. Shelton

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 211 KB
• Volume: 162-164
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)91040-x

✦ Synopsis

Macroscopic magnetic characterization of epitaxial high T c thin fflrns on SrTiOs(110) substrates has been performed using SQUID magnetometry. We have probed the two high symmetry axes which lie in the plane and possess zero macroscopic demagnetization factors ([001] and[1-10]). Zero field cooled and Meissner susceptibility at 10 ° K for H parallel to the c-axis are similar at 20 Oe, begin to diverge at 100 Oe, and are significantly different at 500 Oe. We estimate He1 = 450 Oe for this case. Critical current density e ab 2 d termined from magnetization loops, J~ , for H parallel to the e-axis at 10 ° K is 3-7x10 ~ A/cm for H = 2 to 5 kOe and J~ is about a factor of five or less lower for H applied parallel to the [1-10] direction in the plane which indicates much less anisotropy between the basal plane and c-axis critical currents than has been previously reported in the literature, jgb shows a relaxation effect as a function of time settling to l-3x106 A/cm 2 for the same field range and temperature after 90 minutes.