TY - JOUR
T1 - Pinning performance of (Nd,Eu,Gd)-123 superconductors
T2 - Comparison of melt-textured pellet and single crystal
AU - Jirsa, M.
AU - Rames, M.
AU - Jurek, K.
AU - Muralidhar, M.
AU - Das, P.
AU - Koblischka, M. R.
AU - Wolf, T.
N1 - Funding Information:
This work was accomplished under the support of Grant Agency of the Czech Republic (GACR 202/05/0173), and MEYS of the Czech Republic (1P05ME728). In ISTEC this work was supported by Grant-in-Aid for Science Research from the JSPS.
PY - 2008/6/15
Y1 - 2008/6/15
N2 - We studied pinning homogeneity and the content fluctuation of light rare earth ions in a (Nd0.33Eu0.38Gd0.28)Ba2Cu 3Oy melt-textured (MT) pellet 16 mm in diameter, doped by 0.035 mol% ZnO. The pinning performance was compared to that of the recently grown (Nd0.33Eu0.2Gd0.47)Ba2Cu 3Oy single crystal. While magnetic properties of most test samples cut from the MT pellet were surprisingly uniform, two samples from the pellet center behaved significantly different. This anomaly was found to correlate with the significant departure of the Eu:Nd ratio from the average. Nearly all MT samples showed a high-field shoulder on Jc(B) curve that was attributed to the pinning effect of a nanoscopic correlated lamellar substructure filling channels between regular twin boundaries. As a result, the irreversibility field at 77 K reached in all 20 measured MT samples 9 T. In the single crystal no high-field Jc(B) shoulder was observed, and the irreversibility field at 77 K was about 6 T. The strip-like structure observed on the crystal surface was evidently of another origin than the lamellar substructure in the MT samples and did not significantly contribute to vortex pinning. The secondary peak in Jc(B) of the single crystal was quite strong, showing a well set point-like disorder. All magnetic characteristics of the single crystal were strongly affected by twin-plane channeling effect.
AB - We studied pinning homogeneity and the content fluctuation of light rare earth ions in a (Nd0.33Eu0.38Gd0.28)Ba2Cu 3Oy melt-textured (MT) pellet 16 mm in diameter, doped by 0.035 mol% ZnO. The pinning performance was compared to that of the recently grown (Nd0.33Eu0.2Gd0.47)Ba2Cu 3Oy single crystal. While magnetic properties of most test samples cut from the MT pellet were surprisingly uniform, two samples from the pellet center behaved significantly different. This anomaly was found to correlate with the significant departure of the Eu:Nd ratio from the average. Nearly all MT samples showed a high-field shoulder on Jc(B) curve that was attributed to the pinning effect of a nanoscopic correlated lamellar substructure filling channels between regular twin boundaries. As a result, the irreversibility field at 77 K reached in all 20 measured MT samples 9 T. In the single crystal no high-field Jc(B) shoulder was observed, and the irreversibility field at 77 K was about 6 T. The strip-like structure observed on the crystal surface was evidently of another origin than the lamellar substructure in the MT samples and did not significantly contribute to vortex pinning. The secondary peak in Jc(B) of the single crystal was quite strong, showing a well set point-like disorder. All magnetic characteristics of the single crystal were strongly affected by twin-plane channeling effect.
KW - (Nd,Eu,Gd)BaCuO
KW - Cuprous oxides
KW - High-temperature superconductors
KW - Melt-textured materials
KW - Superconductivity perovskites
KW - Ternary compounds
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U2 - 10.1016/j.mseb.2008.03.014
DO - 10.1016/j.mseb.2008.03.014
M3 - Article
AN - SCOPUS:47949121697
SN - 0921-5107
VL - 151
SP - 25
EP - 30
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
IS - 1
ER -