11th Materials Science School for Young Scientists and Students 2014 (KINKEN-WAKATE 2014)

Fundamentals and Modern Aspects of Superconductivity

Prof. Oleg P. Sushkov

HEADLINE

Magnon Mediated Superconducting Pairing in a Very Lightly Doped Two Dimensional Mott Insulator　

　I start from a very brief reminder of the conventional BCS phonon mediated mechanism of pairing. Then I explain structure of the ground state of the Mott insulator which is the parent compound for cuprate supeconductors. I also explain nature of quasiparticles, holes and magnons, which are excitations above the ground state. I consider interaction between holes and magnons and specifically address the Adler's relation which is important for the mechanism of hole pairing. Finally I demonstrate pairing of holes, discuss nodes of the superconducting gap, coexistence of superconductivity and static magnetism, and scaling of the superconducting gap/temperature with doping.