Specific Features of the Nonlinear Microwave Response of the (Na0.3K0.7)xFe2 – ySe2 Sodium–Potassium Ferroselenide-Based Multiband Superconductorsстатья
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Аннотация:Temperature dependences of the third-harmonic power for the (Na0.3K0.7)(x)Fe2-ySe2 sodium-potassium ferroselenide single crystals have been investigated by nonlinear near-field microwave microscopy. The temperature dependence of magnetic susceptibility at a frequency of 100 kHz for this compound has been measured. The experimental results suggest a double-gap structure of the (Na0.3K0.7)(x)Fe2-ySe2 superconductor.