Nanoparticle additions for enhanced flux pinning in YBCO HTS films

Strickland, N. M.; Long, N.J.; Talantsev, E. F.; Hoefakker, P.; Xia, J.; Rupich, M.W.; Zhang, W.; Li, X.; Kodenkandath, T.; Huang, Yibing

doi:10.1016/j.cap.2007.10.034

Cited by 24 publications

(13 citation statements)

References 18 publications

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“…Added nanodots in MOD-YBCO result in higher values at all angles except for those within about of the -plane direction. The details of the preparation of these samples will be published elsewhere [17]. There is in fact a small decrease in the parallel field which may be due to the added BZO shifting the optimum reaction conditions.…”

Section: F Addition Rules For Critical Currentsmentioning

confidence: 99%

Modeling of Vortex Paths in HTS

Long

Strickland

Talantsev

2007

IEEE Trans. Appl. Supercond.

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A random walk model of the vortex paths in high temperature superconductors is investigated for different relative densities of -axis, -plane and point pinning defects. The model suggests an origin for some of the more unusual features seen in the field angle dependence of the critical current. It also predicts greater noise in critical currents for fields parallel to the plane of the dominant pinning defects and anomalous behavior of -values. The random walk model also suggests an alternative form for the expected field angle dependence of the upper critical fields in disordered layered superconductors.

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Section: F Addition Rules For Critical Currentsmentioning

confidence: 99%

Modeling of Vortex Paths in HTS

Long

Strickland

Talantsev

2007

IEEE Trans. Appl. Supercond.

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“…It was known that the pore formation in YBCO films is related with the excess liquid phase during the film growth, and the formation of interlayer is probably caused by the segregation of Cu 2 O phase at the top of each multi-coated layer [21]. In the case of BZO-doped YBCO film, it is known that the secondary particles containing Zr element can form BaZr 0.5 Y 0.5 O 3 phase [22] which is stable in the YBCO-ZrO 2 system and to have a similar unit cell to BZO or BaZr 1-x Y x O 3 [23]. Therefore, the formation of BZO or BaZr 1-x Y x O 3 compound can affect to the variation in the composition of the precursors, and then excess Cu elements are segregated at the boundaries of multi-coated layers.…”

Section: Resultsmentioning

confidence: 99%

The Improved Critical Currents of MOD-Processed YBCO Thick Films With <inline-formula> <tex-math notation="LaTeX">$\mbox{Ba}M\mbox{O}_3$</tex-math></inline-formula> ( <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>: Ce, Zr) and YBa<sub>2</sub>SnO<sub>5.5 </sub> Particles

Shin

Lee

Choi

et al. 2015

IEEE Trans. Appl. Supercond.

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We report the effects of barium-based perovskite particle inclusions of BaCeO 3 (BCO), BaZrO 3 (BZO), and YBa 2 SnO 5.5 (YBSO) on the thickness dependence of critical current density (J c ) in metal organic deposition (MOD)-processed YBa 2 Cu 3 O 7−δ (YBCO) films on the SrTiO 3 (STO) single-crystal substrate. With increasing film thickness, while BZO-doped YBCO films show a serious degradation in J c , caused by the interlayer at the boundaries of multicoated layers, BCO-and YBSOdoped films exhibit a significant enhancement of J c (77 K, self-field) over ∼1 μm thickness even though BCO-or YBSOdoped YBCO films have degraded in-plane textures compared with undoped films, implying that these perovskite dopants affect not only the pinning properties but also the growth of multicoated layers. The highest critical current (I c ) value over 440 A/cm-width, corresponding to J c value of 1.8 MA/cm 2 , was obtained from the 2.4-μm-thick YBSO-doped film.Index Terms-BaCeO 3 , BaZrO 3 , flux pinning, metal-organic deposition, thickness dependence, YBa 2 SnO 5.5 , YBCO film. 1051-8223

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“…It should be noted that a universal quantitatively accurate equation for critical currents at applied magnetic field, B, is unknown to date as for intrinsic superconductors [15][16][17][18][19], as for…”

Section: Introductionmentioning

confidence: 99%

DC Self-Field Critical Current in Superconductor/Dirac-Cone Material/Superconductor Junctions and The Request for Ballistic Model Reexamination

Talantsev¹

2019

Preprint

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Recently, several research groups have reported on anomalous enhancement of the self-field critical currents, Ic(sf,T), at low temperatures in superconductor/Dirac-cone material/superconductor (S/DCM/S) junctions. Some papers attributed the enhancement to the low-energy Andreev bound states arising from winding of the electronic wave function around DCM. In this paper, Ic(sf,T) in S/DCM/S junctions have been analyzed by two approaches: modified Ambegaokar-Baratoff and ballistic Titov-Beenakker models. It is shown that the ballistic model is an inadequate tool to analyze experimental data from S/DCM/S junctions. The primary mechanism for limiting superconducting current in S/DCM/S junctions is different from the conventional view that the latter is the maximum value within the order parameter phase variation. Thus, there is a need to develop a new model for self-field critical currents in S/DCM/S systems.

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Nanoparticle additions for enhanced flux pinning in YBCO HTS films

Cited by 24 publications

References 18 publications

Modeling of Vortex Paths in HTS

Modeling of Vortex Paths in HTS

The Improved Critical Currents of MOD-Processed YBCO Thick Films With <inline-formula> <tex-math notation="LaTeX">$\mbox{Ba}M\mbox{O}_3$</tex-math></inline-formula> ( <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>: Ce, Zr) and YBa<sub>2</sub>SnO<sub>5.5 </sub> Particles

DC Self-Field Critical Current in Superconductor/Dirac-Cone Material/Superconductor Junctions and The Request for Ballistic Model Reexamination

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