Journal ArticleDOI
Zn doping of YBa2Cu3O7 in melt textured materials: peak effect and high trapped fields
G. Krabbes,G. Fuchs,P. Schätzle,S Gruß,Jai Won Park,Ferdinand Hardinghaus,G Stöver,Roland Hayn,S.-L. Drechsler,T Fahr +9 more
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TLDR
In this article, a modified melt crystallization process (MMCP) was applied to prepare single grain YBCO bulk material with Zn partially substituting for Cu. Hole doping was controlled by an appropriate oxidizing treatment of the as-grown bulk.Abstract:
The previously introduced modified melt crystallization process (MMCP) has been applied to prepare single grain YBCO bulk material with Zn partially substituting for Cu. Hole doping was controlled by an appropriate oxidizing treatment of the as-grown bulk. A field induced pinning was indicated by a well pronounced peak of the critical current density jc in the jc vs. H relationship for the maximal oxidized (overdoped) material containing Zn, whereas pure overdoped YBCO shows no peak effect. The peak effect for Zn-doped YBCO appearing for T=77 K at a relatively high field of about 3 T can be attributed to pair breaking by locally induced magnetic moments due to in plane Zn for Cu substitution. Besides high quality of the bulk YBCO, the peak effect is the reason for the trapped field as large as 1.12 T at 77 K in the cylinder of only 25 mm in diameter.read more
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Superconducting bulk magnets: Very high trapped fields and cracking
TL;DR: In this article, the authors reported improved trapped fields for bulk melt-textured YBa2Cu3O7−δ (YBCO) material in the temperature range between 20 and 50 K.
Journal ArticleDOI
New permanent magnets
TL;DR: In this article, the authors obtained a trapped magnetic field as high as 14.4 T in a melt-textured YBCO bulk sample of a few centimeters in diameter, which is the highest value ever achieved in a bulk superconductor.
Journal ArticleDOI
The effects of Pr-doping on the critical current density in YBa2Cu3O7−δ
Takuya Harada,Katsukuni Yoshida +1 more
TL;DR: In this article, the effects of Pr-doping on the critical current density Jc and the critical temperature Tc in YBa2Cu3O7−δ have been investigated.
Journal ArticleDOI
Enhanced flux pinning properties of YBa2Cu3Oy by dilute impurity doping for CuO chain
TL;DR: In this paper, the effects of dilute impurity doping to the CuO chain of Y123 on the flux pinning properties were studied using single crystals and melt-solidified bulks.
Journal ArticleDOI
Direct measurements of mechanical properties for large-grain bulk superconductors
TL;DR: In this article, the authors measured the mechanical properties of large-grain Y-Ba-Cu-O and Sm−Ba-cu-O bulk superconductors by measuring the strain with the gauges directly mounted onto the sample surface.
References
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Journal ArticleDOI
Dependence of flux-creep activation energy upon current density in grain-aligned YBa2Cu3O7-x.
TL;DR: This demonstration of a nonlinear dependence of {ital U}{sub {ital e}}({ital M}) is capable of resolving anomalies in the magnitudes and temperature dependence of flux-creep activation energies obtained from magnetic-relaxation studies.
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Correlations between magnetic and superconducting properties of Zn-substituted YBa2Cu3O6+x.
TL;DR: In this article, it was shown that Zn induces magnetic moments in the CuO 2 planes, which play a role in the depression of the T variations of the homogeneous susceptibility.
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89Y NMR probe of Zn induced local moments in YBa2(Cu1-yZny)3O6+x.
A. V. Mahajan,A. V. Mahajan,Henri Alloul,Henri Alloul,Gaston Collin,Gaston Collin,J. F. Marucco,J. F. Marucco +7 more
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Spin fluctuations in YBa 2 Cu 3 O 6.6
TL;DR: In this paper, two-dimensional neutron-scattering imaging of YBa2Cu3O6.6 was presented, which revealed that the low-frequency magnetic excitations are virtually identical to those of similarly doped La2−xSrxCuO4.