Specific Features of the Nonlinear Microwave Response of the (Na0.3K0.7)xFe2 – ySe2 Sodium–Potassium Ferroselenide-Based Multiband Superconductors


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Abstract—Temperature dependences of the third-harmonic power for the (Na0.3K0.7)xFe2 – 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)xFe2 – ySe2 superconductor.

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E. Pestov

Institute for Physics of Microstructures, Russian Academy of Sciences; Nizhny Novgorod State University

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Email: pestov@ipmras.ru
俄罗斯联邦, Nizhny Novgorod, 603087; Nizhny Novgorod, 603950

Yu. Nozdrin

Institute for Physics of Microstructures, Russian Academy of Sciences

Email: pestov@ipmras.ru
俄罗斯联邦, Nizhny Novgorod, 603087

A. El’kina

Institute for Physics of Microstructures, Russian Academy of Sciences

Email: pestov@ipmras.ru
俄罗斯联邦, Nizhny Novgorod, 603087

Yu. Erin

Institute for Physics of Microstructures, Russian Academy of Sciences

Email: pestov@ipmras.ru
俄罗斯联邦, Nizhny Novgorod, 603087

M. Lyu

Moscow State University

Email: pestov@ipmras.ru
俄罗斯联邦, Moscow, 119991

A. Boltalin

Moscow State University

Email: pestov@ipmras.ru
俄罗斯联邦, Moscow, 119991

I. Morozov

Moscow State University

Email: pestov@ipmras.ru
俄罗斯联邦, Moscow, 119991

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