Josephson-junction model of critical current in granularY1Ba2Cu

Continuous profiling of magnetotelluric fields

“…Many authors thought the fact that the critical current densities were unusually sensitive to small magnetic fields was because they were the averaged critical current densities of the Josephson weak links which existed inside the ceramics and possibly formed a 3-dimensional matrix. In this matrix is, presumably, formed an array of highly superconducting grains coupled together through the weak links [2] [24]. In support of this, Esteve et al [25] found that the I-V curves of a nonsuperconducting aluminum tip and a superconducting ceramic Lai.8.sSr0.1.sCuO4 showed the characteristics of a…”

Structural features, critical currents and current-voltage characteristics of high temperature superconducting ceramics

“…2) Плот-ность критического тока керамики определяется усредненным по углам разориентации # критиче-ским током межзеренных кон-тактов только в сильнотекстурированной системе : в этом случае можно считать , где а -размер зерна; в противном случае величина оказывается в 2-3 раза меньше ожидаемой. По-следний вывод очень важен: он свидетельствует о том, что часто используемый способ расчета крити-ческого тока керамики путем усреднения критиче-ских токов отдельных ее межзеренных контактов (см., например, [51]) не является корректным, по-скольку не учитывает перколяционной природы рас-сматриваемого явления.…”

Surface morphology and physical properties of partially melt textured Mn doped Bi-2223

“…Another fact that the relation between the suppression of the superconducting transition temperature (Tc) and the local magnetic moment of impurities has generated a great deal of interest in the oxide superconductors. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] From the early days, doping/substitution was one of the most important tools for identifying the nature of the pairing state and microscopic properties. A classical experimental study of the role of magnetic impurities in conventional superconductors was carried out 24 and followed by many in details.…”