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Abstract

NMR Study of the ⁸⁹Y Resonance in fluorinated YBa₂Cu₃O_x

The line shape and Knight shift of the ⁸⁹Y NMR resonance was obtained for fully oxygenated (x = 7), oxygen deficient (x = 6.7) and nonsuperconducting oxygen deficient (x = 6) fluorine-doped YBCO (YBa₂Cu₃O_xF_y). The results show that while flourine can increase the onset superconducting transition temperature T_c in oxygen deficient material, the Knight shift is practically independent of the flourine concentration. The consequences of this result as far as T_c is concerned are discussed.