high-temperature superconductivity - 1 Bose–Einstein condensate 1 Fr¨ohlich Hamiltonian 1 Josephson junction 1 PACS 71.38, 71.38. i, 73.20.D, 74.80.D 1 bipolaron 1 electron-phonon interaction 1 kinetic instability 1 magnon gas 1 magnon superfluidity 1 magnonic crystal 1 microwave devices 1 parametric pumping 1 polaron 1 spin wave 1 spin-wave bullet 1 spin-wave droplet 1 spin-wave logic 1 spin-wave soliton 1 бiполярон 1 високотемпературна надпровiднiсть 1 гамiльтонiан Фрьолiха 1 електрон-фононна взаємодiя 1 полярон 1