Systematics of transport critical-current-density hysteresis in polycrystalline Y-Ba-Cu-O

McHenry, M. E.; Maley, M. P.; Willis, J. O.

doi:10.1103/physrevb.40.2666

Cited by 118 publications

(78 citation statements)

References 8 publications

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“…4. This means that there is no magnetic flux trapping in the vicinity of the grain boundary [7]. The magnetic field was applied perpendicular to the GBJJ.…”

Section: Resultsmentioning

confidence: 99%

Improvement in the Properties of Ag-Doped YBa2Cu3O7-x Grain Boundary Josephson Junctions

Bolaños

Baca

Osario

2000

phys. stat. sol. (b)

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Ag‐doped YBa2Cu3O7–x (YBCO) thin films using 5 to 20 wt% Ag‐doped YBCO targets have been grown by a dc sputtering technique on SrTiO3 bicrystals. Critical currents of 4 to 5 × 106 A/cm2 at 77 K were measured in YBCO films doped with 5 wt% Ag which has been found to be higher than the value of 1 × 106 A/cm2 measured in undoped samples. The normal resistivity decreases by a doping of 5 wt% Ag and increases for higher Ag concentrations. The critical temperature, Tc, of the Ag‐YBCO films remained unchanged at 92 K as in the undoped YBCO samples. An IcRn product of 170 μV at 77 K was found in Grain Boundary Josephson junctions (GBJJs) with 5 wt% Ag, compared with the value of 100 μV measured in undoped samples at the same temperature. Current–voltage characteristics were measured in GBJJs, showing Shapiro steps under microwave radiation and Fraunhofer patterns with an external magnetic field. The improvement in the normal and superconducting properties of Ag‐doped YBCO films has been interpreted using the De Gennes model to establish that YBCO containing metallic Ag addition shows a superconductor–normalmetal–superconductor (S–N–S) behavior, thereby the Ag‐doping enhances the weak link behavior and is, therefore, appropriate for electronic applications.

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“…4. This means that there is no magnetic flux trapping in the vicinity of the grain boundary [7]. The magnetic field was applied perpendicular to the GBJJ.…”

Section: Resultsmentioning

confidence: 99%

Improvement in the Properties of Ag-Doped YBa2Cu3O7-x Grain Boundary Josephson Junctions

Bolaños

Baca

Osario

2000

phys. stat. sol. (b)

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“…As H M is augmented, M G initially traces an S-shaped curve which rises to a plateau [60,63] when a saturation amount of flux has been trapped in the specimen. Consequently I CO , the critical current after a large excursion of H M , is observed to decrease and then trace a flat plain as a function of H M [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Background and Framework Of Our Analysismentioning

confidence: 96%

“…I CO is observed to first diminish, and then trace a flat valley, as a function of H M , the magnitude of the magnetic field H A applied to the specimen in the superconducting state, in order to trap magnetic flux [1][2][3][4][5][6][7][8][9][10][11][12][13]. The flat valley occurs when large excursions of H M establish a saturation remanent magnetization in the specimen.…”

Section: Introductionmentioning

confidence: 99%

The three-particle problem in a model of light radiation

Zhukov¹,

Minlos²

1995

Russ. Math. Surv.

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Altshuler et al discovered that dI CO /d ln t, the rate of increase of the critical current I C with time in polycrystalline high T C samples, traced a peak when measured versus H M , the amplitude of the sweep of the flux trapping magnetic field. We show that the sharp peak in dI CO /d ln t which their model generates arises from a special feature of the formulae they use to describe I C versus H M . Pursuing an extension of these formulae, and exploiting a Brandt-Indenbom formula for the return field of the magnetized grains, we (i) reproduce observations of Altshuler et al, Batista-Leyva et al and a family of curves of dI CO /d ln t reported by Cobas et al, and (ii) estimate the return fields. We also explore the peak structure of dI CO /d ln t versus H M generated by using two well known empirical expressions for I C (H), and the Brandt-Indenbom formula.

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“…Достаточно большое количество работ по гранулярным ВТСП было посвящено определению механизмов диссипации в подсистеме межгранульных границ во внешнем магнитном поле [4][5][6][7][8][9][10][11][12][13][14][15]. Однако, зачастую в подобных исследованиях подсистема межгранульных границ, где происходит диссипация, считалась независимой, и при анализе не принимался во внимание необратимый характер зависимостей магнитосопротивления R(H) [16][17][18][19][20][21][22][23][24][25], критического тока I C (H) [26][27][28][29], а также температурных зависимостей R(T ) [30][31][32][33][34][35], измеренных во внешнем магнитном поле. Объяснение такого нетривиального поведения магнитотранспортных характеристик уже потребовало принятие во внимание взаимодействия подсистем " гранул" и " межгранульных границ".…”

Section: Introductionunclassified

Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

Семенов¹,

Gokhfeld²,

Терентьев³

et al. 2021

Физика Твердого Тела

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The hysteretic magnetoresistance of granular high-temperature superconductor (HTSC) HoBa2Cu3O7-δ is investigated. Superconductors of the YBCO family with magnetic rare earth elements (Nd, Ho, Er, Sm, Yb, Dy) in place of yttrium are characterized by a significant paramagnetic contribution to the total magnetization. Impact of this paramagnetic contribution on the magnetotransport properties is analyzed using the concept of an effective field in an intergranular medium. Lines of magnetic induction from paramagnetic moments do not concentrate in intergranular boundaries, and, thus, have an insignificant effect on magnetotransport properties of granular HTSC. At the same time, there are strong concentration of magnetic flux in the intergranular boundaries due to Meissner currents and Abrikosov vortices. This magnetic flux compression determines the magnetotransport properties of granular HTSCs, including YBCO with magnetic rare earth elements.

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Systematics of transport critical-current-density hysteresis in polycrystalline Y-Ba-Cu-O

Cited by 118 publications

References 8 publications

Improvement in the Properties of Ag-Doped YBa2Cu3O7-x Grain Boundary Josephson Junctions

Improvement in the Properties of Ag-Doped YBa2Cu3O7-x Grain Boundary Josephson Junctions

The three-particle problem in a model of light radiation

Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa-=SUB=-2-=/SUB=-Cu-=SUB=-3-=/SUB=-O-=SUB=-7-delta-=/SUB=-

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