1. Special Astrophysical Observatory RAS, Nizhnij Arkhyz 369167, Russia
2. A.V. Gaponov-Grekhov Institute of Applied Physics RAS, Nizhniy Novgorod 603600, Russia
3. Joint Institute for Nuclear Research, Moscow 141980, Russia
4. The Kotel’nikov Institute of Radio Engineering and Electronics of RAS, Moscow 101990, Russia
5. P.L. Kapitza Institute for Physical Problems RAS, Moscow 119334, Russia
6. Laboratory of Cryoelectronic Systems, The National University of Science and Technology MISIS, Moscow 119049, Russia
7. P.N. Lebedev Physical Institute of RAS, Moscow 119333, Russia