Tuning the peak effect in the Y1−Nd Ba2Cu3O7−δ compound

Gokhfeld, D. M.; Balaev, D. A.; Yakimov, Igor S.; Петров, М. И.; Semenov, S.

doi:10.1016/j.ceramint.2017.05.011

Cited by 13 publications

(8 citation statements)

References 32 publications

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“…where H irr is the irreversibility field. With using these equations, the detailed parametrization of magnetization loops is reached 27 . The expression for the macroscopic critical current density is obtained from Eq.…”

Section: Discussionmentioning

confidence: 99%

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Use of a Sigmoid Function to Describe Second Peak in Magnetization Loops

Gokhfeld

2017

J Supercond Nov Magn

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Order-disorder transitions of a vortex lattice transfer type-II superconductors from a low critical current state to a high one. The similar transition between different current states can be caused by electromagnetic granularity. A sigmoid curve is proposed to describe the corresponding peak in a field dependence of the macroscopic critical density. Using the extended critical state model, analytic expressions are obtained for the field dependencies of the local critical current density, the depth of equilibrium surface region, and the macroscopic critical current density. The expressions are well fit to published data.

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Section: Discussionmentioning

confidence: 99%

“…The presented approach reproduces various magnetization loops with the second peak. Recently magnetization loops of Y 1−x Nd x Ba 2 Cu 3 O 7−δ (x = 0.02, 0.11, 0.25) superconductors were successfully described 26,27 .…”

Section: Discussionmentioning

confidence: 99%

Use of a Sigmoid Function to Describe Second Peak in Magnetization Loops

Gokhfeld

2017

J Supercond Nov Magn

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“…Перед измерениями образец охлаждался в нулевом внешнем поле. [52,54,56]. Видимо, это вызвано частичной экранировкой от внешнего магнитного поля ионов Ho внутри сверхпроводника.…”

Section: экспериментunclassified

“…Видимо, это вызвано частичной экранировкой от внешнего магнитного поля ионов Ho внутри сверхпроводника. Скорее всего, PM вклад возникает только от ионов Ho, находящихся в нормальных сердцевинах вихрей Абрикосова и в приповерхностной области гранул с толщиной около глубины проникновения магнитного поля [54,56]. Построенная в результате разделения вкладов SP петля гистерезиса (рис.…”

Section: экспериментunclassified

“…Магнитные моменты редкоземельного элемента (гольмия) ведут себя как независимая PM-подсистема, о чем свидетельствуют результаты работ [52,54,56]…”

Section: анализ гистерезиса R(h) вклады от мейсснеровских токов вихрейunclassified

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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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