Substitution effects of Fe and Zn on the superconductivity and microstructure of YBa2Cu2O7−δ (YBCO)
Abstract
The substitution of iron and zinc for copper in YBa2Cu3−xMxO7−δ at x = 0.01 have different effects on the microstructure and superconductivity of YBa2Cu3O7−δ (YBCO). From the magnetic susceptibility and resistance measurements, Zn doped YBCO has a Tc ≈ 85 K while the Fe doped YBCO has a Tc ≈ 91 K. This supports studies that Zn doped YBCO suppresses the superconductivity more compared with the Fe-doped YBCO, which is attributed to the absence of local moments at the Zn sites. XRD patterns show that both samples have an orthorhombic structure. Using Scanning Electron Microscopy, the Fe doped sample has the largest grains (approximately 8–10 μm) compared with the undoped YBCO and Zn doped YBCO. This shows that having more connected grains allows easier completion of the superconducting path.
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