Proximity effects and vortex dynamics in superconducting heterostructures

27th International Conference on Low Temperature Physics

Carreira, S.J.^1,3 ; Bekeris, V.^1 ; Rosen, Y.J.^2,4 ; Monton, C.^2 ; Schuller, Ivan K.^2

Departamento de Fisica, FCEyN, Ciudad Universitaria, Buenos Aires

1428, Argentina^1

Department of Physics, Center of Advance Nanoscience, University of California, San Diego, 9500 Gilman Drive, San Diego

CA

92093, United States^2

Dpto. de Materia Condensada, Centro Atómico Constituyentes, CNEA, Av. Gral Paz 1499 (1650), Buenos Aires, Argentina^3

Laboratory for Physical Sciences, College Park

MD

20740, United States^4

关键词: Critical temperatures;    Insulating layers;    Matching fields;    Parabolic temperature;    Proximity effects;    Triangular arrays;    Vortex dynamics;    Vortex lattice dynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022008/pdf
DOI  :  10.1088/1742-6596/568/2/022008

来源: IOP

【 摘 要 】

Vortex lattice dynamics has been studied in thin Nb superconducting films sputtered on top of a dense triangular array of V dots with and without an intermediate SiO2insulating layer. While The insulating layer modifies only slightly The Nb film corrugation, it reduces superconducting commensurability effects (CE) substantially. This implies that superconducting commensurability is dominated by proximity effects. Moreover, The HC2(T) phase diagram of The sample without an insulating layer shows a parabolic temperature dependence near TCand critical temperature oscillations with The periodicity of The matching field. Therefore, strong proximity effects locally suppress superconductivity leading to a superconducting mesh. When The proximity effect is decreased by an insulating layer, HC2(T) follows The expected linear T dependence.