Evolution of superconducting critical temperature in asymmetrical F1/F2/S trilayers due to singlet-triplet correlations and external magnetic field

11th European Conference on Applied Superconductivity

Proshin, Yu. N.^1 ; Avdeev, M.V.^1

Kazan Federal University, Kremlevskaya 18, Kazan, Russia^1

关键词: Critical magnetic field;    Critical temperatures;    External magnetic field;    Numerical calculation;    Parallel magnetic field;    Self-consistency equations;    Superconducting condensates;    Superconducting critical temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/2/022026/pdf
DOI  :  10.1088/1742-6596/507/2/022026

来源: IOP

【 摘 要 】

We theoretically explore a competition between magnetism and superconductivity for the three-layered ferromagnet/superconductor (F/S) structures. The critical properties of F1/F2/S trilayers in an external parallel magnetic field H are investigated. The different mutual orientations of the F layer magnetizations are examined. Under this condition the triplet component of the superconducting condensate is arisen. Assuming that all layers are dirty we solve boundary problem for the Usadel function. To find the critical parameters for trilayer as function of the F layers thicknesses we use Gor'kov's self-consistency equation. The results of numerical calculations for critical temperature Tcand critical magnetic field Hcat various parameters of F/S structure show that the external magnetic field and triplet correlations can essentially influence on the critical properties of considered systems. Unusual dependencies are discussed.