Flux pinning and peak effect in Y-123 superconductor

Yoshimi, D; Migita, M.; Otabe, Edmund Soji; Matsushita, Teruo

doi:10.1016/s0921-4534(01)00318-5

Cited by 7 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is also interesting to note the fact that the peak J c values of Dy-Ba-Cu-O are large and comparable to those of LRE-Ba-Cu-O. Generally, the peak effect based on oxygen deficiency is much smaller than that based on RE/Ba substitution [18,19,24]. This is mainly ascribed to the fact that the introduction of oxygen defects also causes the deterioration of the superconducting matrix.…”

Section: Discussionmentioning

confidence: 92%

“…which is ascribed to RE/Ba substitution rather than oxygen deficiency, since the peak effect is enhanced by oxygen annealing. It has been reported that oxygen defects are responsible for the peak effect in the Y123 single crystal [17] and melt-textured Y123 bulk sample [18,19], since there is no RE/Ba solid solution. It is known that Dy123 also has no RE/Ba solid solubility region [20,21], since the ionic radius of Dy 3+ ion (1.027 Å) is smaller than that of the LRE 3+ ion (LRE = Nd, Sm, Eu, Gd; 1.053-1.109 Å).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Superconducting properties of Dy$ndash$Ba$ndash$Cu$ndash$O bulk superconductors

Nariki

Murakami

2002

Supercond. Sci. Technol.

View full text Add to dashboard Cite

We report on the superconducting properties of melt-textured Dy123 bulk superconductors containing 5 to 40 mol% Dy211. Dy–Ba–Cu–O bulk samples were fabricated with the cold-seeding method in air using a Nd123 seed crystal. The superconducting properties of the bulk samples were strongly affected by the Dy211 content and the oxygen-annealing temperature. In the Jc–B curve of the Dy123 sample with 5 mol% of Dy211, the secondary peak was clearly observed at the applied fields of 0.5–2.0 T. The peak Jc values were 32 000–37 000 A cm−2 at 77 K. The peak position shifted to lower fields with increasing oxygen-annealing temperature, presumably due to an increase in oxygen vacancies. We believe that the peak effect in Dy–Ba–Cu–O is ascribed to oxygen deficiency, since RE/Ba substitution is not present in the system. This idea was supported by the fact that the secondary peak decreased with increasing Dy211 contents and disappeared in the Dy123 sample with 40 mol% of Dy211.

show abstract

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Superconducting properties of Dy$ndash$Ba$ndash$Cu$ndash$O bulk superconductors

Nariki

Murakami

2002

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…This result shows that the decreased rapidly when the magnetic field increased. No peak effect (PE) [17], [18] was observed in this sample. This result is reasonable because the DyBCO films were deposited without artificial defects to act as pinning centers.…”

Section: B Measurement In a DC Magnetic Fieldmentioning

confidence: 65%

Relationship Between Surface Resistance and Critical Current Density of HTS Thin Films in a DC Magnetic Field

Saito

Shirakawa

Kitamura

et al. 2005

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

We investigated the relationship between the surface resistance (R s ) and critical current density (J c ) of DyBa 2 Cu 3 O 7 (DyBCO) thin films in a dc magnetic field. The R s of DyBCO films at 21.8 GHz was measured using a dielectric resonator method and the J c was determined by magnetic measurement and Bean's model. A dc magnetic field of up to 5 T was applied along the c-axis of the films. The relationship between the R s and J c of DyBCO thin films under a zero magnetic field was explained by the following equation, R s = 10 7 J c , where is a constant of 1.2, and the units of the R s and J c are ohm and A m2 , respectively. In addition, the R s in dc magnetic fields up to 5 T were inversely proportional to the J c . However, the parameter , which was fitted from the R s J c characteristics in each magnetic field, increased slightly with an increase the magnitude of the applied field. These results indicate that the relationship between the R s and J c in a zero magnetic field may be a general property of HTS thin films and that the in DyBCO thin films depends on the magnitude of the applied magnetic field.Index Terms-Dielectric resonator, high-temperature superconductor, magnetic field measurement, thin films.

show abstract

“…In previous measurements [7,8], it was found that J c decreased in the medium field region and the peak effect disappeared through the addition of 211 phase particles to Y-123 bulk superconductor. In addition, Mochida et al [9] found that the peak effect at medium fields decreased through the addition of Nd-422 particles in Nd-123.…”

Section: Introductionmentioning

confidence: 88%

Flux pinning properties of (Nd,Eu,Gd)Ba₂Cu₃O_y(NEG-123) superconductor with 211 phase particles

Hasan

Kiuchi

Otabe

et al. 2007

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Flux pinning properties were investigated by focusing on the origin of the high peak critical current density and the high irreversibility field for Nd0.33Eu0.38Gd0.28Ba2Cu3Oy (NEG-123) bulk superconductors with the addition of 211 secondary phase particles of volume fractions up to 10 mol%. It was found that a negative correlation exists between the peak critical current density Jcp and the irreversibility field Bi for various fractions of added 211 phase. This suggests that the mechanisms that determine Jcp and Bi are different. The 211 particles do not contribute to the peak effect neither directly through the pinning mechanisms of the condensation energy interaction nor indirectly with the aid of the order–disorder transition of flux lines. Other possible defects are nano-lamella structures. Although these defects do not directly contribute to the peak effect through the pinning mechanism of the condensation energy interaction, they may contribute to it with the aid of the order–disorder transition of flux lines. On the other hand, as Bi deteriorates with the addition of 211 particles, it is not determined by the flux pinning of 211 particles. The decrease in Bi is considered to be caused by the proximity effect of nano-lamella structures.

show abstract

Flux pinning and peak effect in Y-123 superconductor

Cited by 7 publications

References 5 publications

Superconducting properties of Dy$ndash$Ba$ndash$Cu$ndash$O bulk superconductors

Superconducting properties of Dy$ndash$Ba$ndash$Cu$ndash$O bulk superconductors

Relationship Between Surface Resistance and Critical Current Density of HTS Thin Films in a DC Magnetic Field

Flux pinning properties of (Nd,Eu,Gd)Ba₂Cu₃O_y(NEG-123) superconductor with 211 phase particles

Contact Info

Product

Resources

About

Flux pinning and peak effect in Y-123 superconductor

Cited by 7 publications

References 5 publications

Superconducting properties of Dy$ndash$Ba$ndash$Cu$ndash$O bulk superconductors

Superconducting properties of Dy$ndash$Ba$ndash$Cu$ndash$O bulk superconductors

Relationship Between Surface Resistance and Critical Current Density of HTS Thin Films in a DC Magnetic Field

Flux pinning properties of (Nd,Eu,Gd)Ba2Cu3Oy(NEG-123) superconductor with 211 phase particles

Contact Info

Product

Resources

About

Flux pinning properties of (Nd,Eu,Gd)Ba₂Cu₃O_y(NEG-123) superconductor with 211 phase particles