![Sample our Earth Sciences journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5930/TOC-Subject-Sample-2021-Earth-Sciences.jpg"})
Abstract
The temperature dependences of the Cu2+ ESR signal intensity in YBa2Cu3Ox samples with different oxygen stoichiometry (6.21 ≤ x ≤ 6.93) and in a Y2BaCuO5 sample (“green phase”) as well as the temperature dependences of dc magnetic susceptibility have been measured. The paramagnetic susceptibilities of YBa2Cu3Ox and Y2BaCuO5 determined by ESR technique and by dc magnetic susceptibility measurements are found to be characterized by different Curie-Weiss temperatures. The conclusion has been reached that the observed in YBa2Cu3Ox Cu2+ ESR signal is intrinsic and is not connected with the impurity phase Y2BaCuO5. The weak Cu2+ ESR signal observed in the orthorhombic superconducting samples (x > 6.5) is related to the presence of tetragonal regions with a decreasing oxygen content.