Magnetically Mediated Cooper Pairing in Heavy Fermion Superconductors
Frontiers of Condensed Matter Physics Lecture -- LIVE @ Rice
Date: Thursday, November 5
Time: 3:10 PM CST
Place: SST 106
Speaker Prof. Dirk Morr (Univ. Illinois Urbana Champaign)
Title: Magnetically Mediated Cooper Pairing in Heavy Fermion Superconductors
Abstract: While magnetically mediated Cooper pairing is the conjectured basis of heavy-fermion superconductivity, no direct verification exists. In this talk, I will demonstrate how one can use the heavy-fermion band structure derived from quasiparticle interference (QPI) imaging to determine the momentum-space structure of the f-electron magnetic interactions in the heavy fermion material CeCoIn5. Solving the superconducting gap equations on its two heavy-fermion bands with the hypothesis that these interactions mediate the Cooper pairing, yields a series of quantitative predictions about the superconductive state, such as the momentum structure of the superconducting gap, Tc, phase sensitive QPI, the position of the magnetic resonance, and the spin-rattice relaxation rate. The agreement between these diverse predictions and the measured characteristics of superconducting CeCoIn5 provides strong and direct evidence that its Cooper pairing is mediated by the f-electron magnetism.