Temperature dependence of the first critical field of YBa2Cu3Ox single crystals with various oxygen contents
Moshchalkov V. V., Marin C., Henry J. Y., Rossat-Mignod J., Jacqout J. F.
The temperature dependence of the first critical field, Hcl (Τ), has been measured in YBa2 Cu3 Ox single crystals by an Μ\n 0 extrapolation method (Mt is the trapped magnetization). These measurements were carried out in the orientations HI С and Η11 c. The anisotropy of Hcl increases sharply, from Η \\ (0) /Н Lc\ (0) -4.1 М#Й(0) =270 Ое)/[Я^(0) = 21 Oe] = 10, as the oxygen content decreases from χ = 6.9 to χ = 6.64.