Effect of oxygen stoichiometry on the out-of-plane anisotropy of YBa₂Cu₃O_7-deltasingle crystals near optimal doping

Abstract

We have performed magnetic measurements on pure detwinned YBa2Cu3O7- single crystals in order to investigate the influence of variations in the oxygen stoichiometry on the out-of-plane anisotropy ck in the region close to optimal doping (6.90 < 7- < 6.98). The anisotropy is estimated using the anisotropic London model from the period of the commensurability oscillations of the hysteretic magnetization as observed for fields applied parallel to the a-b-planes. For a variation in the oxygen deficiency by as much as 300%, we find that ck decreases but only slightly (less than 12%) with decreasing oxygen deficiency. The possibility of a temperature-dependent ck is also discussed.

A simple model to estimate the optimal doping of p - Type oxide superconductors

“…This result is in good agreement with the experimental result (y = 6.9) reported in the literature 26 . Using the model described in the previous calculation, we may estimate the necessary oxygen content to obtain the optimal doping of a great number of p-type cuprate superconductors.…”

Room Temperature Superconductivity

“…The result (6) is in good agreement with the result (x = 6.9) reported in (Kokkallaris et al, 1999). Using the simple model just described, we estimate the necessary oxygen content to obtain the optimal doping of the most relevant p-type cuprate superconductors.…”

A Model to Study Microscopic Mechanisms in High-Tc Superconductors

“…The result (5) is in good agreement with the result (x = 6.9) reported in (Kokkallaris et al, 1999). In the next section, using the above method, we estimate the oxygen content for optimal doping of the most important p-type copper oxide superconductors.…”