Hybrid superconducting mesa-heterostructure with manganite-ruthenate interlayer

11th European Conference on Applied Superconductivity

Constantinian, K.Y.^1 ; Ovsyannikov, G.A.^1,2 ; Sheyerman, A.E.^1 ; Shadrin, A.V.^1,2 ; Kislinskii, Y.V.^1 ; Kalabukhov, A.^2 ; Winkler, D.^2

Kotel'Nikov Institute of Radio Engineering and Electronics RAS, Moscow, Russia^1

Chalmers University of Technology, Gothenburg, Sweden^2

关键词: Correlation lengths;    Exchange fields;    Interlayer thickness;    Josephson effect;    Nonsinusoidal current;    Spatial direction;    Spin triplet;    Superconducting current;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/4/042007/pdf
DOI  :  10.1088/1742-6596/507/4/042007

来源: IOP

【 摘 要 】

We present experimental data on Josephson effect in hybrid superconducting mesa-heterostructures (HSMH) with composite manganite-ruthenate interlayer. The HSMH base electrode consisted of the cuprate superconductor YBa2Cu3O7grown epitaxially on a NdGaO substrate using laser ablation. The interlayer was composed from in-situ deposited SrRuO3(F1) and La0.7Sr0.3MnO3(F2) thin films, each characterized by different directions of magnetization. The top electrode was Nb/Au thin film. A superconducting current was observed when the interlayer thickness was well above the correlation length, determined by the exchange field in F1 and F2. Obtained IC(H) dependences and non-sinusoidal current-phase relation evaluated from microwave measurements are discussed in terms of generation of long-range spin triplet superconducting current component in heterostructures with interfaces of singlet superconductors and bilayer ferromagnetic materials with different spatial directions of magnetization.