Poster presentation "The Influence of Interband Scattering on the Intertype Mode in Dirty Two-Band Superconductors" was presented by a Senior Researcher of the Center for Quantum MetamaterialsIAC Project at the XXX Symposium on Nanophysics and Nanoelectronics.
The symposium was held in Nizhny Novgorod March 9- 13, 2026, and brought together more than six hundred scientists from Russia and other countries. It was the largest condensed matter physics conference in Russia, covering a wide range of topics in the physics of superconducting, magnetic, and semiconductor systems, multilayer X-ray optics, and quantum technologies. The results reached by Senior Researcher Marychev P.M. and Chief Researcher Shanenko A.A. and presented in the Poster were highly regarded by the participants.
The presented results are a development of the results of a work recently published in the highly rated journal Frontiers of Physics. In this work, the intertype regime in “dirty” - i.e. containing a large number of defects – two-band superconductors was theoretically considered. Intertype superconductivity, which is a transition between standard I and II types of superconductivity, 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 vortex fluid. In clean single-band superconductors, the intertype domain exists in a fairly narrow region of parameters, but in dirty superconductors, it becomes vanishingly small. P. Marychev showed that when the diffusion coefficients in different bands differ significantly from each other, the region of intertype superconductivity in such superconductors expands significantly compared to the single-band case.
However, the previous work only considered intraband scattering on impurities. However, in two-band dirty superconductors, interband impurity scattering plays a significant role in mixing different bands. Unlike intraband scattering, interband impurity scattering leads to a decrease in the critical temperature of the superconducting transition. In this report, we have studied the impact of interband impurity scattering on the existence of the intertype regime. We have shown that the intertype regime is highly resistant to interband impurity scattering. Moreover, in some cases (for example, in the FeSe0.94 compound), weak scattering even expands the region of its existence. This discovery confirms the stability and controllability of the intertype regime in dirty two-band superconductors, which is important for the development of new technologies based on it.
This work was supported by the International Academic Cooperation Project of the Higher School of Economics "The Influence of Competing Interactions and Topology on the Critical Parameters of Modern Superconducting Materials."
