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VOLUME 53 (1991) | ISSUE 3 | PAGE 157
Temperature dependence of the first critical field of YBa2Cu3Ox single crystals with various oxygen contents
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 ó and Η11 c. The anisotropy of Hcl increases sharply, from Η \\ (0) /î Lc\ (0) -4.1 í#ê(0) =270 ïÅ)/[ñ^(0) = 21 Oe] = 10, as the oxygen content decreases from χ = 6.9 to χ = 6.64.