Impact of Heat Treatments and Hole Density (p) on the Structural, Electrical, and Superconducting Properties of LnSrBaCu₃O_6+z (Ln = Eu, Sm, Nd) Compounds  

作　　者：Mohammed Bellioua Mohamed Id El Amel Fatima Bouzit Mohamed Errai Driss Soubane Aderrahim Ait Khlifa Mohammed Khenfouch Issam Mouhti Ahmed Tirbiyine Essediq Youssef El Yakoubi Abdelhakim Nafidi Mohammed Bellioua;Mohamed Id El Amel;Fatima Bouzit;Mohamed Errai;Driss Soubane;Aderrahim Ait Khlifa;Mohammed Khenfouch;Issam Mouhti;Ahmed Tirbiyine;Essediq Youssef El Yakoubi;Abdelhakim Nafidi(Laboratory of Materials, Electrical Systems, Energy and Environment, Department of Applied Physics, Faculty of Applied Sciences, Ibnou Zohr University, Agadir, Morocco;LAMISNE Laboratory, Polydisciplinary Faculty of Taroudant, Ibn Zohr University, Agadir, Morocco;Department of Physics, Polydisciplanry Faculty Safi, Cadi Ayyad University, Marrakech, Morocco;ALLS Laboratory at INRS-EMT, Varennes, Canada;Laboratory of Condensed Matter Physics and Nanomaterials for Renewable Energy, Faculty of Sciences, Agadir, Morocco)

机构地区：[1]Laboratory of Materials, Electrical Systems, Energy and Environment, Department of Applied Physics, Faculty of Applied Sciences, Ibnou Zohr University, Agadir, Morocco [2]LAMISNE Laboratory, Polydisciplinary Faculty of Taroudant, Ibn Zohr University, Agadir, Morocco [3]Department of Physics, Polydisciplanry Faculty Safi, Cadi Ayyad University, Marrakech, Morocco [4]ALLS Laboratory at INRS-EMT, Varennes, Canada [5]Laboratory of Condensed Matter Physics and Nanomaterials for Renewable Energy, Faculty of Sciences, Agadir, Morocco

出　　处：《Communications and Network》2023年第4期83-97,共15页通讯与网络（英文）

摘　　要：In this study, we thoroughly examined the impact of heat treatments and hole count (p) on the properties of LnSrBaCu₃O_6+z (Ln = Eu, Sm, Nd) compounds. We focused on preparation, X-ray diffraction with Rietveld refinement, AC susceptibility, DC resistivity measurements, and heat treatment effects. Two heat treatment types were applied: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. As the rare earth Ln’s ionic radius increased, certain parameters notably changed. Specifically, c parameter, surface area S, and volume V increased, while critical temperature Tc and holes (p) in the CuO₂ plane decreased. The evolution of these parameters with rare earth Ln’s ionic radius in [AO] heat treatment is linear. Regardless of the treatment, the structure is orthorhombic for Ln = Eu, tetragonal for Ln = Nd, orthorhombic for Ln = Sm [AO], and pseudo-tetragonal for Sm [O]. The highest critical temperature is reached with Ln = Eu (Tc [AO] = 87.1 K). Notably, for each sample, Tc [AO] surpasses Tc [O]. Observed data stems from factors including rare earth ionic size, improved cationic and oxygen chain order, holes count p in Cu(2)O₂ planes, and in-phase purity of [AO] samples. Our research strives to clearly demonstrate that the density of holes (p) within the copper plane stands as a determinant impacting the structural, electrical, and superconducting properties of these samples. Meanwhile, the other aforementioned parameters contribute to shaping this density (p).In this study, we thoroughly examined the impact of heat treatments and hole count (p) on the properties of LnSrBaCu₃O_6+z (Ln = Eu, Sm, Nd) compounds. We focused on preparation, X-ray diffraction with Rietveld refinement, AC susceptibility, DC resistivity measurements, and heat treatment effects. Two heat treatment types were applied: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. As the rare earth Ln’s ionic radius increased, certain parameters notably changed. Specifically, c parameter, surface area S, and volume V increased, while critical temperature Tc and holes (p) in the CuO₂ plane decreased. The evolution of these parameters with rare earth Ln’s ionic radius in [AO] heat treatment is linear. Regardless of the treatment, the structure is orthorhombic for Ln = Eu, tetragonal for Ln = Nd, orthorhombic for Ln = Sm [AO], and pseudo-tetragonal for Sm [O]. The highest critical temperature is reached with Ln = Eu (Tc [AO] = 87.1 K). Notably, for each sample, Tc [AO] surpasses Tc [O]. Observed data stems from factors including rare earth ionic size, improved cationic and oxygen chain order, holes count p in Cu(2)O₂ planes, and in-phase purity of [AO] samples. Our research strives to clearly demonstrate that the density of holes (p) within the copper plane stands as a determinant impacting the structural, electrical, and superconducting properties of these samples. Meanwhile, the other aforementioned parameters contribute to shaping this density (p).

关 键 词：High-Tc Superconductors Heat Treatments Hole Density (p) Tc Parameter c Surface ab Electrical Resistance X-Ray Diffraction 

分 类 号：TG1[金属学及工艺—金属学]