Dr. Pavel Marychev, the Researcher of the Centre for Quantum Metamaterials has presented the poster presentation at the International Symposium "Nanophysics and Nanoelectronics"
The impressive results of the Centre's Researchers' work were presented at the XXVIII International Symposium "Nanophysics and Nanoelectronics" in a poster presentation "Transition from type II to Type I superconductivity in dirty ferromagnetic superconductors". The symposium was held in Nizhny Novgorod on March 11 - 15, 2024 and brought together more than six hundred scientists from all over Russia, as well as from other countries. This is the largest conference on condensed matter physics in Russia, covering a wide range of issues from the physics of superconducting, magnetic and semiconductor systems, multilayer X-ray optics and quantum technologies.
Dr. Marychev's report has aroused great interest among the participants.
It was based on recent work published in The Journal of Physical Chemistry Letters, part of Q1. The work itself is a development of the results of the work of the Center's employees Alexey Vagov and Arkady Shanenko with co-authors from Russia, Brazil and France, recently published in the highly rated journal Communications Physics.
Dr. Marychev's work theoretically considers "dirty" - i.e., containing a large number of defects – ferromagnetic superconductors with a Curie temperature lower than the critical temperature of the superconducting transition. In the study of A. Vagov and A. Shanenko, it was shown that in the case of pure ferromagnetic superconductors with a decrease in temperature from critical to Curie temperature, a transition from type II superconductivity to type I through a sufficiently wide domain of intertype superconductivity is possible.
The intertype mode is characterized by an unusual interaction between vortices, which leads to exotic configurations of the magnetic field in a superconductor – clusters, chains and droplets of a vortex liquid. In pure conventional superconductors, this domain exists in a fairly narrow range of parameters, but in dirty superconductors it becomes vanishingly small. At the same time, doping may be required to create ferromagnetic superconductors, which generates defects in the superconductor.
Dr..Marychev showed that in dirty ferromagnetic superconductors, similarly to the pure case, the intertype domain, due to the interaction of superconductivity with the magnetic subsystem, becomes wide and comparable in size to the intertype regime in pure ferromagnetic superconductors. At the same time, the transition from type II to type I superconductivity through the intertype mode is achieved by simply changing the temperature, and the intertype mode itself is large enough for experimental study even with large values of the Ginzburg-Landau parameter corresponding to deep type II in conventional superconductors.
Thus, the presence of defects has little effect on the intertype domain in ferromagnetic superconductors and does not prevent its detection and investigation.