Growth of single-domain (Sm0.5Eu0.5)Ba2Cu3O7−δ with high Tc and Jc by employing a thermal gradient

Hu, Anming; Sakai, Naomichi; Murakami, Masato

doi:10.1063/1.1367305

Cited by 47 publications

(37 citation statements)

References 22 publications

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“…The oxygen‐controlled melt‐textured growth method, which uses low during the fabrication of an (LRE)BCO superconductor, was found to be the most effective way to improve the superconducting properties of an (LRE)BCO bulk by suppressing an LRE/Ba substitution 20 . Different methods, such as a high crystallization rate 21 and postannealing in Ar, 22 using Ba‐rich precursors, 23 etc., have been developed to suppress the extent of LRE/Ba substitution during melt processing of (LRE)BCO bulks in an air atmosphere. However, in contrast to Sm and Nd systems, the transition temperature of the Gd system bulk superconductors did not appear to decrease considerably when they were fabricated in air 24 .…”

Section: Study Of the Superconducting Properties Of Gdbco Singlementioning

confidence: 99%

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Cheng

Yan

et al. 2011

Journal of the American Ceramic Society

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In this study, we report new approaches for the fabrication of Gd-Ba-Cu-O (GdBCO) bulk with a large size and promising superconducting properties, applying the cold-seeding melttextured (MT) method. Firstly, NdBCO thin films were used as seeds because of their superheating properties and an additional mini pellet was inserted between the seed and the bulk precursor. This approach allows to reach a higher maximum processing temperature (T max ) and a wider window for single grain growth, leading to the growth of large-sized bulk, 56 mm in diameter. Secondly, the use of both air and pure oxygen atmosphere in the growth process of GdBCO bulks indicates that high oxygen partial pressure has little impact on superconducting properties, which, however, effectively facilitates the growth rate. Thus, an oxygen-rich MT process is promisingly suggested for producing large-sized GdBCO bulks with insignificant degradation of superconducting properties. Finally, a new Ba-rich precursor was applied by adding an Sm242 compound. It was deduced that the addition of a substantial amount of Sm242 may enhance the critical current density J c with an insignificant reduction of T c .

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Section: Study Of the Superconducting Properties Of Gdbco Singlementioning

confidence: 99%

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Cheng

Yan

et al. 2011

Journal of the American Ceramic Society

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“…Reference [9] reported a method to analyse the composition fluctuation by TEM with EDS. We applied a similar analysis in our SmBCO crystals: sample A with inferior T c = 70 K and sample D with T c = 95 K were selected for comparison.…”

Section: Resultsmentioning

confidence: 99%

Crystal growth of a high-T_cSmBCO superconductor in 1 atm oxygen pressure

Cai¹,

Yao²,

Hu³

et al. 2006

Supercond. Sci. Technol.

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Sm 1+x Ba 2−x Cu 3 O z (SmBCOss) single crystals with T c = 95 K and a sharp transition were grown by top-seeded solution growth in 1 atm oxygen pressure. Compositional analysis by the inductively coupled plasma (ICP) technique and T c measurement with a superconducting quantum interference device (SQUID) indicate that a nearly stoichiometric SmBCO phase with a high T c value can be reached in a rather wide range of liquid compositions and oxygen partial pressures. Specific features of the SmBCO system phase diagram were elucidated that explain why the SmBCO single crystals grow more easily than YBa 2 Cu 3 O z (YBCO) or Nd 1+x Ba 2−x Cu 3 O z (NdBCO) ones. The surface morphology of nanostripes was investigated by atomic force microscopy (AFM). The nanostripes were thought to act as an effective pinning medium, due to the comparable scale with the vortex core. Furthermore, two SmBCO samples with typical T c values were analysed by energy-dispersive spectroscopy (EDS) and the composition fluctuations along their stripes were studied.

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“…For example, in many bulk forms and multilayer applications, Y is replaced by Nd, Sm, or other rare-earth elements. 6,7 Although a nice trend of the maximum T c in RBa 2 Cu 3 O 7−␦ superconductors has been revealed previously, 4,5 detailed studies at the microscopic scale are missing due to the complexity of both the geometry and electronic structures.…”

Section: Introductionmentioning

confidence: 92%

Electronic mechanism of critical temperature variation inRBa2Cu3O7−δ

Chen

2005

Phys. Rev. B

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We have performed systematic studies of the trend of the critical temperature T c due to both Madelung site potential difference between in-plane oxygen and copper sites ⌬V M and interlayer effect in the optimally doped 123 superconductors RBa 2 Cu 3 O 7−␦ . ⌬V M is found to decrease with the increase of the trivalent rare-earth ionic radius r R 3+. This change enhances the next-nearest-neighbor hopping integral tЈ, which results in the experimentally observed increase of T c with r R 3+. The coherent interlayer single-particle hopping t Ќ has a more profound effect than tЈ on the nearly linear trend of T c as a function of r R 3+. These results reveal the importance of the electronic origin of the rare-earth ionic size effect on T c in this family.

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Growth of single-domain (Sm0.5Eu0.5)Ba2Cu3O7−δ with high Tc and Jc by employing a thermal gradient

Cited by 47 publications

References 22 publications

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Crystal growth of a high-T_cSmBCO superconductor in 1 atm oxygen pressure

Electronic mechanism of critical temperature variation inRBa2Cu3O7−δ

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Growth of single-domain (Sm0.5Eu0.5)Ba2Cu3O7−δ with high Tc and Jc by employing a thermal gradient

Cited by 47 publications

References 22 publications

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Large Size and High Performance of a Gd–Ba–Cu–O Bulk Superconductor Grown Using New Approaches

Crystal growth of a high-TcSmBCO superconductor in 1 atm oxygen pressure

Electronic mechanism of critical temperature variation inRBa2Cu3O7−δ

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Crystal growth of a high-T_cSmBCO superconductor in 1 atm oxygen pressure