DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2012 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Fe-based Superconductors - 122 Part 2 & Theory

TT 17.5: Talk

Tuesday, March 27, 2012, 10:45–11:00, H 2053

Magnetic Resonance from the Interplay of Frustration and Superconductivity — •Johannes Knolle1, Ilya Eremin2, Jorg Schmalian3, and Roderich Moessner11Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany — 2Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany — 3Karlsruhe Institute of Technology, Institute for Theory of Condensed Matter, D-76131 Karlsruhe, Germany

Motivated by iron-based superconductors, we develop a self-consistent electronic theory for the itinerant spin excitations in the regime of coexistence of the antiferromagnetic stripe order with wave vector Q1=(π,0) and s± superconductivity. The onset of superconductivity leads to the appearance of a magnetic resonance near the wave vector Q2=(0,π), where magnetic order is absent. This resonance is isotropic in spin space, unlike the excitations near Q1, where the magnetic Goldstone mode resides. We discuss several features which can be observed experimentally. In particular, we find that the additional subtle effects of microscopic coexistence of AF and s± SC order, such as damping of the spin waves at Q1 and the modified dispersing behavior of the spin resonance around Q2, can be used by INS to distinguish the coexistence phenomenon from phase separation effects.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2012 > Berlin