Abstract
We analyze an experiment in which two distinct superconducting phases YBa2Cu3O7−δ (Y123) and Y3Ba5Cu8O18−δ (Y358) coexisted. This experiment enabled us to characterize the recently introduced Y358 phase in contrast to the Y123 phase, thus to resolve some discrepancies reported in associated properties of Y358. Specifically, our experiment indicates the transition temperature \(T_{\mathrm{C}}^{\mathrm{mid}}=105~\mathrm{K}\) and 94 K for Y358 and Y123, respectively, and that Y358 has five CuO2 planes and three CuO chains, with Pmm2 symmetry and lattice parameter (a,b,c)=(3.845,3.894,31.093) Å, in agreement with density functional theory predictions for this specific structure.
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The authors acknowledge the Iranian Nano Technology Initiative Council and Alzahra University for partial financial support.
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Appendix
We characterized crystal features such as the crystal morphology, lattice parameters, Miller indices, crystallite size, and dominant and/or undesirable phases of our samples (the two featuring both phases) by the X-ray diffraction pattern (XRD) [Philips® PW1800 with Cu κ α radiation with λ=1.542 Å (2θ range of 4–90°)]. The mean grain size of the samples was examined by Hitachi® S4160 Field Emission Scanning Electron Microscopy (FE-SEM). A four-probe technique was used for transport measurements. The size of the samples was about 9×6×1 mm3, and the applied DC current (Lake Shore®-120) was 10 mA. The temperature was monitored by a Lutron®-TM917 (with 0.01 K resolution). The electrical resistance of the sample at room temperature was less than 0.7 Ω and the voltmeter accuracy was in the μV range.
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Gholipour, S., Daadmehr, V., Rezakhani, A.T. et al. Structural Phase of Y358 Superconductor Comparison with Y123. J Supercond Nov Magn 25, 2253–2258 (2012). https://doi.org/10.1007/s10948-012-1611-4
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DOI: https://doi.org/10.1007/s10948-012-1611-4