Journal ArticleDOI
Flux pinning mechanism for Nd-Ba-Cu-O superconductor
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In this article, the authors investigated the upper solubility limit of Nd123ss in industrial argon and critically reviewed these flux pinning mechanisms on the basis of a phase transformation theory.Abstract:
Unlike YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (Y123) which is a line compound for the cations, the Nd-Ba-Cu-O superconductor forms a solid solution Nd/sub 1+x/Ba/sub 2-x/Cu/sub 3/O/sub 7-/spl delta// (Nd123ss) between Nd and Ba. The presence of such a solid solution tends to cause a depression of the superconducting transition temperature (T/sub c/) and a broad transition. Processing in a low oxygen partial pressure (Po/sub 2/) can produce a high T/sub c/ and enhanced critical current density (J/sub c/). However, there are controversies on flux pinning mechanisms for this material, In this paper, we investigated the upper solubility limit of Nd123ss in industrial argon and critically reviewed these flux pinning mechanisms on the basis of a phase transformation theory. We believe that precipitation mechanism based on the change of the solubility limits of Nd123ss with Po/sub 2/ offers a consistent explanation to the enhanced flux pinning in the system. This may provide guidelines for further improvement in superconducting properties of bulk 123 materials.read more
Citations
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Field solutions for the Swihart wave and surface plasmon in superconducting/dielectric film multilayer structures in the mixed state
TL;DR: In this article, the authors used the electrodynamic field equations for a type-II superconductor in the mixed state to derive the field solutions for two model structures such as a superconducting planar waveguide and a superlattice.
Book ChapterDOI
Chapter 189 Single-crystal growth for science and technology
Yuh Shiohara,Eugene A. Goodilin +1 more
TL;DR: In this article, the authors discuss the single-crystal growth for science and technology and discuss the intrinsic limit of the metastability by the condition that the free energy barrier against nucleation decreases to the order of the thermal energy fluctuations ( ∼kT ).
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Nanoparticulate composites of melt textured YBa2Cu3O7−x superconductors
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TL;DR: In this article, the effect of neodymium oxide and platinum addition on processing parameters of melt textured Y123 superconductors is discussed, by considering solidification kinetics.
References
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Journal ArticleDOI
Oxygen-defect flux pinning, anomalous magnetization and intra-grain granularity in YBa 2 Cu 3 0 7–δ
TL;DR: The anomalous magnetization characteristic, intra-grain granularity and the magnitude of the flux pinning in single crystals of YBa2Cu307-δ are intimately linked as mentioned in this paper.
Journal ArticleDOI
Melt processing for obtaining NdBa2Cu3Oy superconductors with high Tc and large Jc
TL;DR: In this paper, a dc magnetization measurement of Nd1+xBa2−xCu3Oy (Nd123) superconductors was performed in a reduced oxygen atmosphere.
Journal ArticleDOI
Melt-processed light rare earth element - Ba - Cu - O
TL;DR: In this article, the microstructural and superconducting properties of light rare earth elements (LREs) are reviewed and the flux pinning mechanism is also discussed, on the basis of their study over the last several years, the melt processes for LRE - Ba - Cu - O are described.
Journal ArticleDOI
Free-space electro-optics sampling of mid-infrared pulses
Q. Wu,Xi-Cheng Zhang +1 more
TL;DR: In this paper, coherent detection of ultra-broadband mid-infrared electromagnetic pulses using a 30μm-thick ZnTe electro-optic sensor was reported.
Journal ArticleDOI
Flux pinning in melt-grown NdBa2Cu3Oy and SmBa2Cu3Oy superconductors
Masato Murakami,Sang-Im Yoo,Takamitsu Higuchi,Naomichi Sakai,Jurgen Weltz,Naoki Koshizuka,Shoji Tanaka +6 more
TL;DR: In this paper, the authors showed that rare earth (RE) ions with large radii exhibit relatively low T c due to the presence of RE-Ba solid solution and that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere.