Effect of the Composition and the Crystal Structure on the Electrophysical Properties of the Ni1–xWx System at Low Temperatures

Influence of intragranular Meissner currents and magnetic flux trapped in granules on the effective field in the intergranular medium and the magnetoresistance hysteresis of a granular HTSC

“…To date, a model has been proposed that explains the totality of the magnetotransport properties of [21][22][23][24][25][26][27][28][29], which at first glance are difficult to explain. It is possible to note a series of recent works in which features of the behavior of the electrical resistance of granular Y−Ba−Cu−O in external fields were discovered, indicating the course of the Berezinsky-Kosterlitz-Taules topological phase transition in the intergranular medium [30][31][32][33][34]. For some low-temperature superconductors, effects related to the Josephson coupling between superconducting granules [35][36][37], or superconducting areas, are also observed [38], and, as a consequence, with the implementation of a two-level superconducting system.…”

On Magnetometric Determination of the Radiation Defect Concentration in a Superconducting GdBa2Cu3O7 – x Film

“…Let us introduce the two-dimensional critical-current density j c (B Z ). The relation of the three-dimensional critical current density J c (Z) and j c (B Z ) is determined as follows: (1) where h is the superconducting layer thickness.…”

“…An inhomogeneity of the defect distribution in a semiconductor can lead to local inhomogeneity of changing the superconducting characteristics in the material bulk. This inhomogeneity, in turn, can lead to unusual physical phenomena, for example, the appearance of phase transition in current similar to the transitions observed in granular HTSC YBa 2 Cu 3 O 7 -x [1]. In this work, we propose and justify an express magnetometric technique which allows the determination of the inhomogeneity of changes in supercon-ducting properties of a thin layer of GdBa 2 Cu 3 O 7 -x (GdBaCuO123) superconductor caused by radiation irradiation.…”

Влияние Внутригранульных Мейсснеровских Токов И Захваченного В Гранулах Потока На Эффективное Поле В Межгранульной Среде И Гистерезис Магнитосопротивления Гранулярного ВТСП

“…К настоящему времени предложена модель, объясняющая совокупность, на первый взгляд, сложных для объяснения, магнитотранспортных свойств [21][22][23][24][25][26][27][28][29]. Можно отметить серию недавних работ, в которых были обнаружены особенности поведения электросопротивления гранулярного Y−Ba−Cu−O во внешних полях, указывающие на протекание топологического фазового перехода Березинского-Костерлица-Таулеса в межгранульной среде [30][31][32][33][34]. Для некоторых низкотемпературных сверхпроводников также наблюдаются эффекты, связанные с джозефсоновской связью между сверхпроводящими гранулами [35][36][37], или сверхпроводящими областями [38], и, как следствие, с реализацией двухуровневой сверхпроводящей системы.…”