Effects of calcium doping on the superconducting properties of top-seeded melt growth processed Y1.5Ba2−Ca Cu3O  superconductors

Park, S.D.; Kim, H.J.; Park, B.J.; Han, Young-Hee; Jun, Byung‐Hyuk; Lee, J.S.; Kim, C.-J.

doi:10.1016/j.physc.2011.05.079

Cited by 4 publications

(4 citation statements)

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“…On the other hand, the increase in charge carrier concentration caused by Ca doping influences the T c (critical superconducting transition temperature) and the J c (critical current density) of superconductors. [14][15][16][17][18][19] As an in-depth study, sizable Y 1−x Ca x Ba 2 Cu 3 O y (Ca-YBCO) single crystals with a high doping level are essential, especially for neutron scattering experiments. The self-flux technique, as the simplest method, is widely used in the growth of single crystals.…”

Section: Introductionmentioning

confidence: 99%

Modified top-seeded melt growth for large sized Y_1−xCa_xBa₂Cu₃O_ycrystals

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Modified top-seeded melt growth for large sized Y_1−xCa_xBa₂Cu₃O_ycrystals

et al. 2014

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“…Ever since the effect of calcium overdoping at the grain boundaries in the thin film was found, numerous studies relating to the calcium substitutions for the YBa 2 Cu 3 O z (YBCO or Y123) system have been performed to examine the physical properties of these compounds. In particular, several reports indicate that the value of charge carrier concentration ( p ) raised by calcium doping, which further influences the superconducting transition temperature ( T c ) and the critical current density ( J c ) of the polycrystalline powders, thin films, and melt‐processed bulks …”

Section: Introductionmentioning

confidence: 99%

“…To date, due to the difficulty in growing highly doped REBCO single crystals in centimeters, the top‐seeded melt‐textured growth (TSMTG) is considered to be a promising method to process large doped bulk superconductors. The effect of Ca doping has been investigated in melt‐processed YBCO and GdBCO bulk superconductors . Nevertheless, the growth of highly Ca‐doped REBCO single domain with a large size encountered two main obstacles: (1) the growth rate decreases significantly with the increasing CaCO 3 content; (2) unexpected spontaneous nucleation occurs as the amount of CaCO 3 is more than 1 wt% .…”

Section: Introductionmentioning

confidence: 99%

“…The effect of Ca doping has been investigated in melt‐processed YBCO and GdBCO bulk superconductors . Nevertheless, the growth of highly Ca‐doped REBCO single domain with a large size encountered two main obstacles: (1) the growth rate decreases significantly with the increasing CaCO 3 content; (2) unexpected spontaneous nucleation occurs as the amount of CaCO 3 is more than 1 wt% . Hence, it is necessary to investigate the doping effect on the growth behaviors to achieve the critical doping.…”

Section: Introductionmentioning

confidence: 99%

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Growth of Ca‐Doped Large Grain Gd–Ba–Cu–O Superconductors

Cheng

Kou

et al. 2012

J. Am. Ceram. Soc.

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The effect of calcium doping on growing GdBa 2 Cu 3 O z (GdBCO or Gd123) bulk superconductors using top-seeded melt-textured growth (TSMTG) method in air was studied. NdBCO thin films deposited on MgO substrate were effectively used as cold-seeds because of their superheating natures, which allow them enduring a higher maximum processing temperature (T max ) than that of a conventional TSMTG process. Several heavily Ca-doped GdBCO (up to 3 wt% CaCO 3 ) single domains were obtained without heterogeneous nucleation. Moreover, an interesting phenomenon of negative growth was observed during the cooling-down process of Ca-GdBCO, which prevented the grain from further crystallization. The compositional analysis revealed that the Ca content has a declined tendency from the initial growth region toward the edge. It is deduced that the effective Ca distribution coefficient k > 1, which gives rise to a decreased peritectic temperature (T p ) with the reduction of the Ca content, is the main origin of the negative growth behavior. To overcome this obstacle, a two-stage cooling procedure was developed, i.e., slow cooling followed by fast cooling, to compensate the loss of the growth driving force caused by the decrease of T p . Consequently, a highly doped Ca-GdBCO bulk was grown with a size of 14 mm 2 .

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