Registration Number
0223U005489,
(0122U200260)
, R & D reports
Title
Study of factors affecting on the microwave response of Fe-chalcogenide films
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Дослiдження вiдгуку плiвок Fe1+уSе1-хТех в залежностi вiд їх складу (спiльно з ІФ КАН)
Head
Cherpak Mykola T.,
Registration Date
22-12-2023
Organization
O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine
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The project aims to obtain the dependence of the peculiarities in FeSe1-xTex films discovered by the authors together with scientists of the Institute of Physics of the Chinese Academy of Sciences on external and internal factors and to perform analysis of the experimental results in order to obtain an answer to the nature of the identified feature. If the obtained results indicate a connection with the topological superconductivity of FeSe1-xTex, an attempt will be made to build a model of the influence of the Majorana bound states on FeSe1-xTex response. These states are now seen as an important prospect for the creation of qubits.
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SUPERCONDUCTORS WITH IRON IONS, TEMPERATURE DEPENDENCE OF MICROWAVE RESPONSE OF SUPERCONDUCTORS, EFFECTIVE MICROWAVE IMPEDANCE, TOPOLOGICAL SUPERCONDUCTOR, MAJORANA BOUND STATES.
The object of research is the processes of interaction of the microwave (MW) field with unusual superconductors in the superconducting state.
The purpose of the work is to conduct a comparative analysis of the characteristics of the response of the resonator with films of type II superconductors and to study the influence of a number of factors on the characteristics of the response of the resonator with the FeSeTe film.
Research methods – experimental measurement of the MW response of resonators with a superconductor film as a function of temperature with subsequent determination of the surface resistance of the films as a characteristic of the absorption of MW energy.
The results of the improvement of the vacuum chamber in the composition with the SRDK-415DP cryocooler are presented.
Numerical modeling of the electrodynamic characteristics of a superconducting cylindrical resonator with the H0m1 type of oscillations in the X- and K-frequency bands with the sample was carried out. The resonator (IP of CAS) was used to measure a number of new samples of FeSe1-xTex superconductor films.
A general analysis of all experimental results obtained by the authors in 2022 and 2023 was conducted and a hypothesis is formulated: the peculiarity of the response of the FeSeTe superconductor film in the MW magnetic field is caused by two competing mechanisms of the dissipation of the MW energy in the film, one mechanism associated with magnetic vortices increases the dissipation, the second is due to Majorana bound states in the near-surface layer of the film with topological superconductivity, reduces it.
Product Description
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Barannyk Oleksandr A.
Vovniuk Maksym V.
Hubin Oleksii I.
Melnyk Serhii I.
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2023-12-22
