We have studied the influence of Fe impurities in high-temperature superconductors of the type Y1.2Ba0.8CuO_4-δ and YBa₂Cu₃O_7-δ on the critical temperature as measured by the resistance transition. The chemical compositions of the different phases have been determined using a scanning electron microscope and electron-probe microanalysis. We find that for low concentrations Fe substitutes for Cu in the superconducting phase. The transition temperature decreases linearly as a function of the Fe concentration, in remarkable analogy with the situation in conventional superconductors with paramagnetic impurities.
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Mehbod et al. (1987) studied this question.
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