Date:
Sun, 28/05/201712:00-13:30
Location:
Danciger B building, Seminar room
Lecturer: Prof. V. R. Shaginyan
Affiliation: Petersburg Nuclear Physics Institute, NRC "Kurchatov Institute"
Abstract:
Our report presents a theory which solves an experimental puzzle, found recently in overdoped high-Tc superconductors, which discovers strong deviations of their physical properties from those described by the classical Bardeen - Cooper - Schrieffer theory. Namely, recent interesting experimental paper (J.I. Bozovic, X. He, J. Wu, A.T. Bollinger, Nature 536, 309 (2016)) gives a unique possibility to make insights into the physical mechanisms of long-standing puzzle of high-Tc superconductivity. The main conundrum of the cited experiment is that the concentration of superconducting electrons is much less then whole number of electrons in a superconductor, contrary to the well-known Leggett theorem. Theory, based on the topological fermion condensation quantum phase transition, gives the clue to this puzzle, unveiling the underlying physics, and closing the colossal gap between these empirical findings and Bardeen-Cooper-Schrieffer-like theories.
Affiliation: Petersburg Nuclear Physics Institute, NRC "Kurchatov Institute"
Abstract:
Our report presents a theory which solves an experimental puzzle, found recently in overdoped high-Tc superconductors, which discovers strong deviations of their physical properties from those described by the classical Bardeen - Cooper - Schrieffer theory. Namely, recent interesting experimental paper (J.I. Bozovic, X. He, J. Wu, A.T. Bollinger, Nature 536, 309 (2016)) gives a unique possibility to make insights into the physical mechanisms of long-standing puzzle of high-Tc superconductivity. The main conundrum of the cited experiment is that the concentration of superconducting electrons is much less then whole number of electrons in a superconductor, contrary to the well-known Leggett theorem. Theory, based on the topological fermion condensation quantum phase transition, gives the clue to this puzzle, unveiling the underlying physics, and closing the colossal gap between these empirical findings and Bardeen-Cooper-Schrieffer-like theories.