SIDORENKO, A.; SÜRGERS, C.; TRAPPMANN, T.; WOSNITZA, J.; LÖHNEYSEN, H. v.
(Springer Nature Switzerland, 1996)
Measurements of the upper critical fieldBc2of superconducting Nb/Cu multilayers with fractal and periodic stacking sequence are reported. A positive curvature of the perpendicular magnetic field Bc2⊥, i.e. an upward deviation ...