Specific Features of the Nonlinear Microwave Response of the (Na{sub 0.3}K{sub 0.7}){sub x}Fe{sub 2 –} {sub y}Se{sub 2} Sodium–Potassium Ferroselenide-Based Multiband Superconductors

Abstract—Temperature dependences of the third-harmonic power for the (Na{sub 0.3}K{sub 0.7}){sub x}Fe{sub 2 –} {sub y}Se{sub 2} sodium–potassium ferroselenide single crystals have been investigated by nonlinear near-field microwave microscopy. The temperature dependence of magnetic susceptibility at...

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Published inPhysics of the solid state Vol. 60; no. 11
Main Authors Pestov, E. E., Nozdrin, Yu. N., El’kina, A. I., Erin, Yu. S., Lyu, M., Boltalin, A. I., Morozov, I. V.
Format Journal Article
LanguageEnglish
Published United States 15.11.2018
Subjects
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
IRON COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MICROWAVE RADIATION
MONOCRYSTALS
NONLINEAR PROBLEMS
POTASSIUM COMPOUNDS
SELENIUM COMPOUNDS
SODIUM COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
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Summary:Abstract—Temperature dependences of the third-harmonic power for the (Na{sub 0.3}K{sub 0.7}){sub x}Fe{sub 2 –} {sub y}Se{sub 2} 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 (Na{sub 0.3}K{sub 0.7}){sub x}Fe{sub 2 –} {sub y}Se{sub 2} superconductor.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418110240