Influence of fluorine on the superconducting properties of YBa2Cu3O7–<i>y</i>
V. V. EremenkoB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, Kharkov 1Vladimir I. MakarovPhysicotechnical Institute, Kharkov 2V. V. ZhukovI. V. KrivosheiA. M. Gorky State University, Kharkov 4I. G. KorsunskayaA. M. Gorky State University, Kharkov 4Vladimir KleinerPhysicotechnical Institute, Kharkov 2O. N. OvcharenkoPhysicotechnical Institute, Kharkov 2N. S. TereshinaPhysicotechnical Institute, Kharkov 2E. N. KhatskoB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, Kharkov 1
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Аннотация
Complex investigations of yttrium-based HTS compounds containing 0&lt;x &lt;1.5 fluorine are investigated. Knight shift has been observed in 19F nuclei and may serve as a reliable indicator of fluorine in the crystal lattice of Y-based compounds. Fluorine was introduced into the compound by the method of solid phase diffusion by replacing a part of Y2O3 with YF3. Three samples of multiphase Y-based compounds have revealed a metastable superconducting state at a temperature of ∼240 K.
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