DocumentCode :
1367045
Title :
Correlation Between Enhanced 
, the Unit Cell Volume and AC Magnetic Shielding in Argon Preheated (SrBa)Cu<sub>3</sub>O<sub>6.94</sub>. 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 ε (for 0 ≤ x ≤ 1), T<sub>c</sub> (for x ≥ 0.45) and by 6 K to 87 K for x = 1 [AO], and the distance d[Cu(1)-Sr/Ba] (decrease T<sub>c</sub>) for x <; 0.4 and decrease it (increase T<sub>c</sub>) 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<sup>´</sup>(<i>T</i>)) in the case of the samples [AO] at all T <; T<sub>c</sub> and for any applied field for x >; 0.5. For each x and heat treatment, S(x) decreases when H<sub>dc</sub> 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; p<sub>Sh</sub> and in-phase purity for the [AO] samples may account for the observed data.</div>
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<div class='leftDiv labelDiv col-xs-4 col-sm-2 fullRecLabelEnglish'>Keywords : </div><div class='valueDiv leftDirection leftAlign col-xs-8 col-sm-10 fullRecValueEnglish'>X-ray diffraction; annealing; electrical resistivity; europium compounds; heat treatment; high-temperature superconductors; lattice constants; magnetic shielding; magnetic susceptibility; phonons; yttrium compounds; (Y<sub>1-x</sub>Eu<sub>x</sub>)(SrBa)Cu<sub>3</sub>O<sub>6+z</sub>; AC magnetic shielding; AC magnetic susceptibility measurement; Rietveld refinement; X-ray diffraction; argon annealing; carrier charge-phonon interaction; electrical resistivity; heat treatment; linear resistivity parameters; orthorhombicity; oxygen annealing; unit cell volume; Argon; Conductivity; Copper; Correlation; Heat treatment; Magnetic shielding; Temperature measurement; <formula formulatype=)
$({rm Y}_{1-{rm x}}{rm Eu}_{rm x})({rm SrBa}){rm Cu}_{3}{rm O}_{6+{rm z}}$ ceramic cuprites; AC magnetic shielding; Rietveld refinement; chain oxygen order-disorder; heat treatments control of $T_{c}$
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2010.2088372
Filename :
5617312
Link To Document :
