Correlation Between Enhanced ${\rm T}_{\rm c}$, the Unit Cell Volume and AC Magnetic Shielding in Argon Preheated $({\rm Y}_{1-{\rm x}}{\rm Eu}_{\rm x})({\rm SrBa}){\rm Cu}_{3}{\rm O}_{6+{\rm z}}$
| Autor: | M. Braigue, M. Massaq, A. Nafidi, R Suryanarayanan, Essediq Youssef El Yakoubi, M S Vinod, Hassan Chaib, J. Hemine, R. Morghi |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Rietveld refinement Annealing (metallurgy) Analytical chemistry chemistry.chemical_element Condensed Matter Physics Oxygen Magnetic susceptibility Electronic Optical and Magnetic Materials Lattice constant Nuclear magnetic resonance chemistry Electrical resistivity and conductivity X-ray crystallography Shielding effect Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 21:2732-2736 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2010.2088372 |
| Popis: | We report here on the preparation, X-ray diffraction with Rietveld refinement, resistivity and AC magnetic susceptibility measurements of (Y1-xEux)(SrBa)Cu3O6.94. Each sample was subject to two types of heat treatment: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. For each x, the [AO] treatment increases the orthorhombicity e (for 0 ≤ x ≤ 1), Tc (for x ≥ 0.45) and by 6 K to 87 K for x = 1 [AO], and the distance d[Cu(1)-Sr/Ba] (decrease Tc) for x ; 0.4. In the normal state, the [AO] treatment reduced the linear resistivity parameters indicating a diminution of the interaction of carrier charges with phonons. There was a remarkable improvement in the shielding effect S (amplitude of χ'(T)) in the case of the samples [AO] at all T ; 0.5. For each x and heat treatment, S(x) decreases when Hdc and the temperature increase. Remarkable correlations were observed. A combination of several factors such as decrease in d[Cu(1)-(Sr/Ba)] ; increase in cationic and chain oxygen ordering; pSh and in-phase purity for the [AO] samples may account for the observed data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|