Triplet superconductivity in oxide ferromagnetic interlayer of mesa-structure

International Conference on Strongly Correlated Electron Systems 2014

Ovsyannikov, G.A.^1,2 ; Constantinian, K.Y.^1 ; Sheerman, A.E.^1 ; Shadrin, A.V.^1,2 ; Kislinski, Yu V.^1 ; Khaydukov, Yu N.^3 ; Mustafa, L.^3 ; Kalabukhov, A.^2 ; Winkler, D.^2

Kotel'Nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia^1

Chalmers University of Technology, Department of Microtechnology and Nanoscience, Gothenburg, Sweden^2

Max-Planck Institute for Solid State Research, Stuttgart, Germany^3

关键词: Epitaxial heterostructures;    Ferromagnetic interlayers;    Ferromagnets;    Long ranges;    Mesa structure;    Superconducting critical current;    Superconducting current;    Triplet superconductivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012136/pdf
DOI  :  10.1088/1742-6596/592/1/012136

来源: IOP

【 摘 要 】

We present experimental data on Nb-Au/La0.7Sr0.3MnO3/SrRuO3/YBa2Cu3O7-δmesa- structure with in plane linear size 10÷50 μm. The mesa-structures were patterned from the epitaxial heterostructures fabricated by pulsed laser ablation and magnetron sputtering. Superconducting critical current was observed for mesa-structures with the interlayer thicknesses up to 50 nm. In the mesa-structures with just one, either La0.7Sr0.3MnO3or SrRuO3interlayer with a thickness larger than 10 nm no superconducting current was observed. The registered superconducting current for the mesa-structures with a thinner interlayer is attributed to pinholes. Obtained results are discussed in terms of superconducting long-range triplet generation at interfaces of superconductor and a composite ferromagnet consisting of ferromagnetic materials with non-collinear magnetization.