High current density in bulk YBa2Cu3O<i>x</i> superconductor

Saláma, K.; Selvamanickam, V.; Gao, Li; Sun, Ke

doi:10.1063/1.101525

Cited by 767 publications

(144 citation statements)

References 6 publications

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“…This is easily seen in FIGURE 3 where all the elements increase in atomic % with increasing size, or increasing W atomic % except Cu, which instead decreases. It is widely observed in melt-textured YBCO superconductor that large deposits (up to several hundred micrometers in size) of a compound rich in Ba and Cu is a byproduct of the texturing process, e.g., [1][2][3][4][5][6][8][9]. A similar analysis (not shown) of the (W +Pt)-doped samples also concluded that Cu is not a component of the W-Pt-Y-Ba-O particles.…”

Section: Microstructurementioning

confidence: 62%

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The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk Ybco: One Acts as Pinning Centers and the Other Does Not

Sawh¹,

Weinstein²,

Parks³

et al. 2010

AIP Conference Proceedings

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Two types of large grain YBCO samples doped with tungsten oxide, one with platinum and the other without, were produced using a slow cooling process. Observations of the trapped magnetic flux density showed that the flux density of the W-doped, Pt-free samples did not change with W doping levels of up to 2.1 mol%. In contrast, the (W + Pt)-doped samples resulted in a monotonic improvement in trapped magnetic flux density as a function of W doping. Microstructure studies indicate that both types of samples contain profuse sub-micrometer deposits of a W-rich compound. The Pt-free samples contain (W 0.4 Y 0.6 )BaO 3 deposits while the (W + Pt)-doped samples contain deposits of a (W 0.5 Pt 0.5 )YBa 2 O 6 compound. Both types of deposits are of essentially the same size and have comparable number density. The results are strikingly similar to an earlier experiment in which uranium doped, Pt-free, large grain YBCO also did not show any improvement in trapped magnetic flux density. The U-doped, Pt-free samples contain profuse sub-micrometer deposits of a (U 0.4 Y 0.6 )BaO 3 compound, which have been shown to be ferromagnetic. The inability of both the (W 0.4 Y 0.6 )BaO 3 and (U 0.4 Y 0.6 )BaO 3 submicrometer deposits to act as pinning centers in self-field, suggest that this behavior is systematic.

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Section: Microstructurementioning

confidence: 62%

“…The ball-milled powders were pressed into cylindrical samples 1.9 cm in diameter, top-seeded with SmBa 2 Cu 3 O 7-δ (Sm123), and melt-textured using a slow cooling process [6]. Textured samples were subsequently annealed in flowing oxygen gas.…”

Section: Methodsmentioning

confidence: 99%

The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk Ybco: One Acts as Pinning Centers and the Other Does Not

Sawh¹,

Weinstein²,

Parks³

et al. 2010

AIP Conference Proceedings

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“…A YBa 2 Cu 3 O 7-y (YBCO) superconductor has a high superconducting critical temperature (T c ) of 93 K [1], and a high critical current density (J c ) at the magnetic fields [2][3][4]. The electric transport capacity of a YBCO superconductor is dependent on the microstructure, especially the size and density of the micro-defects present in the superconducting grain.…”

Section: Introductionmentioning

confidence: 99%

Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa₂Cu₃O_7-y bulk superconductors

Jung¹,

Go²,

Joo³

et al. 2017

Progress in Superconductivity and Cryogenics

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The effects of the crystallographic orientation and sample thickness on the magnetic levitation forces (F) and trapped magnetic field (B) of single grain YBCO bulk superconductors were examined. Single grain YBCO samples with a (001), (110) or (100) surface were used as the test samples. The samples used for the force-distance (F-d) measurement were cooled at 77 K without a magnetic field (zero field cooling, ZFC), whereas the samples used for the B measurement were cooled under the external magnetic field of a Nd-B-Fe permanent magnet (field cooling, FC). It was found that F and B of the (001) surface were higher than those of the (110) or (100) surface, which is attributed to the higher critical current density (J c ) of the (001) surface. For the (001) samples with t=5-18 mm, the maximum magnetic levitation forces (F max s) of the ZFC samples were larger than 40 N. About 80% of the applied magnetic field was trapped in the FC samples. However, the F and B decreased rapidly as t decreased below 5 mm. There exists a critical sample thickness (t=5 mm for the experimental condition of this study) for maintaining the large levitation/trapping properties, which is dependent on the material properties and magnitude of the external magnetic fields.

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“…This has been achieved by, for instance, melt processing (1,2). This technique, however, only improves the current carrying capacity on a small length scale.…”

Section: Introductionmentioning

confidence: 99%

The influence of additives on the current carrying capacity of bulk YBa2Cu3OX

Küper

Hoogendam²,

Hemmes

et al. 1990

Physica B: Condensed Matter

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We studied the influence of using different powders and several additives on the shaping process and critical current density of sintered bulk YBa 2 Cu 3 0 x ' It was found that all additives used facilitated the shaping process. Silver and most organic additives influenced the critical current density only little, Zinc reduced it to zero, but an ethylenebisstearoylamide compound doubled the critical current density as compared to samples without additives.

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High current density in bulk YBa2Cu3Ox superconductor

Cited by 767 publications

References 6 publications

The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk Ybco: One Acts as Pinning Centers and the Other Does Not

The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk Ybco: One Acts as Pinning Centers and the Other Does Not

Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa₂Cu₃O_7-y bulk superconductors

The influence of additives on the current carrying capacity of bulk YBa2Cu3OX

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High current density in bulk YBa2Cu3Ox superconductor

Cited by 767 publications

References 6 publications

The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk Ybco: One Acts as Pinning Centers and the Other Does Not

The Puzzle of Two Different Sub-Micrometer Tungsten-Rich Deposits in Bulk Ybco: One Acts as Pinning Centers and the Other Does Not

Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa2Cu3O7-y bulk superconductors

The influence of additives on the current carrying capacity of bulk YBa2Cu3OX

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Orientation and thickness dependence of magnetic levitation force and trapped magnetic field of single grain YBa₂Cu₃O_7-y bulk superconductors