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Variation of the superconducting and structural properties of Y2Ba4Cu7Ozwith oxygen content (14.1<z<15.3, 30 K ⩽ Tc ⩾ 95 K)

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Published in Physica C: Superconductivity and Its Applications. 1992, vol. 192, no. 1-2, p. 137-146
Abstract A great number of pure and homogeneous Y2Ba4Cu7Oz samples were investigated by AC susceptibility, field cooling magnetization measurements, X-ray diffraction, microprobe analysis and microstructural examinations in a light microscope and a scanning electron microscope. The oxygen content z between 14.1 and 15.3 was determined by the reduction of the samples in a hydrogen flow. To reach the (z-T-p) equilibrium, well-crystallized samples were annealed in pure oxygen (10−6 ⩽p(O2)⩽102 bar) between 300 and 900°C and subsequently quenched. The specimens produced in this way show sharp χAC transitions in the entire range of critical temperatures (30 K ⩽ Tc ⩽ 95 K). The correlation Tc versus the orthorhombicity 2(b−a)/(b+a) is almost linear, similar to that observed in YBa2Cu3Ox. This is contrast to the distinct behaviour of the functions Tc versus z and Tc versus x in these two compounds. We present a stability-decomposition map 0for Y2Ba4Cu7Oz over a wide range of (T, p) coordinates.
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GENOUD, Jean-Yves et al. Variation of the superconducting and structural properties of Y2Ba4Cu7Ozwith oxygen content (14.1Physica C: Superconductivity and Its Applications, 1992, vol. 192, n° 1-2, p. 137-146. https://archive-ouverte.unige.ch/unige:94414

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