A theoretical basis of the approach for the magnetic field penetration measurement

2nd Conference on Plasma & Laser Research and Technologies

Bezotosnyi, P.I.^1 ; Yu Gavrilkin, S.^1 ; Ivanenko, O.M.^1 ; Mitsen, K.V.^1 ; Yu Tsvetkov, A.^1

Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow

119991, Russia^1

关键词: Currents distributions;    Film surfaces;    Kinetic inductances;    Linear response;    London penetration depth;    Low-frequency alternating magnetic fields;    Magnetic field penetrations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/747/1/012027/pdf
DOI  :  10.1088/1742-6596/747/1/012027

来源: IOP

【 摘 要 】

An approach for the assessment of London penetration depth of superconducting films is proposed. This approach is based on the analysis of linear response of the sample to a local low-frequency alternating magnetic field generated by the measuring coil disposed near the film surface. A visual "electrical engineering" model of induced currents distribution in the superconductor taking into account the kinetic inductance was developed for a description of this response. The possibility of determining of the penetration depth from changing the inductance of the system "coil-sample" is shown in the framework of this model. The sensitivity of the proposed method for the films with different thicknesses is considered.