Effect of symmetry on the resistive characteristics of proximity coupled metallic multilayers

Interface transparency and proximity effect in Nb/Cu triple layers realized by sputtering and molecular beam epitaxy

“…The obtained value for the interface transparency of Nb/Cu prepared by MBE is therefore only slightly higher than the one obtained in the case of sputtering deposition, for which the reflectivity measurements have shown a higher interface roughness. Moreover the T values are comparable to others reported in the literature in the case of Nb/Cu layered systems [19,25]. It is worthy of note that the validity regime of equation (3) compare these obtained values for T with the theoretical ones based on the Fermi velocities' mismatch.…”

Effect of geometrical symmetry on the angular dependence of the critical magnetic field in superconductor/normal metal multilayers

“…Indeed, the 2D behavior corresponds to ഛ d S and z falls into the center of one of S layers. 16 From the experimental data of Figs The positions of the nuclei of the superconducting phase are in close relation to the character of H c ͑⌰͒ dependences, as follows from the analysis of the data for our even and odd Nb/ Pd multilayers. For finite S/N multilayers the position of the nucleus, ͗z͘ ⌰=0 = z 0 , accesses one of the discrete available values corresponding to the upper critical magnetic field.…”

“…12,[28][29][30] Apart from this aspect other theoretical attempts have been done to describe the whole H c ͑⌰͒ curve mainly for infinite multilayers of different coupling nature between S layers. [31][32][33][34][35][36] On the other hand, the finiteness of the multilayers samples ͑i.e., the precise position of the superconducting nucleus͒ has been found to be a very important parameter in determining, for example, the resistive transition to the superconducting state 16 and the shape of the H-T phase diagram. 17 From this viewpoint the survey of the H c ͑⌰͒ characteristics in multilayers with the possibility of finetuning the position of superconducting nucleus is of great significance at least for two reasons: first, because of the mutual relation between the H c ͑⌰͒ shape and the nucleation position of the superconducting phase and, second, because in multilayers it is possible to precisely control, change, and know the position where the superconducting phase nucleates.…”

“…[2][3][4][5][6][7][8][9][10][11][12] In particular, rather comprehensive understanding of the nature of the dimensional crossover-namely, the transition from three-dimensional ͑3D͒ to two-dimensional ͑2D͒ mode upon a variation of the temperature T-leads to deeper insight into the interaction between the superconducting layers and into the superconducting phase nucleation. [13][14][15] Recently, 16,17 we have shown that the dimensionality of finite S/N multilayers can be influenced by the "odd-even" effect related to the sample finiteness ͑in particular, the number of bilayers, odd or even͒ which determines the nucleation position of the superconducting phase. 18 The angular dependence of H c can be of highest importance to get additional useful information about the structure of multilayers, about the interaction between S layers as well as between the adjacent S and N layers, and about the origin of the superconducting phase nucleation in anisotropic superconductors.…”

Superconducting Order Parameter Nucleation and Critical Currents in the Presence of Weak Stray Fields in Superconductor/Insulator/Ferromagnet Hybrids

“…Apart from this, the location (relative to the domain wall) and the shape of the superconducting nuclei was studied [38]. In the case of stripe domains, when the field close to the ferromagnet can be approximated by a step function, the nucleation in the S-film is similar to the case of S/N structures (N is a normal metal) [43][44][45].…”