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Lecture Dirk K. Morr


14 November 2003 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker:Prof.dr. Dirk K. Morr
Affiliation:Department of Physics, University of Illinois at Chicago, USA
Title:First-order superconducting transition near a ferromagnetic quantum critical point
Date:Fri Nov 14, 2003
Location:FWN-Building 5116.0116
Host:J. Knoester
Telephone:+31 50 3634369


Over the last few years, superconductivity near a ferromagnetic quantum critical point (FQCP) has attracted considerable theoretical and experimental attention. In this talk, I consider a state exhibiting triplet superconductivity on the paramagnetic side of the FQCP and discuss the nature of its superconducting transition. Previous studies solved the linearized gap equation within the Eliashberg formalism and found that the superconducting transition is of second order, and Tc is strongly reduced near the FQCP due to pair-breaking effects from thermal spin fluctuations. In contrast, I demonstrate by solving the full set of nonlinear Eliashberg equations that near the FQCP, the system avoids pair-breaking effects by undergoing a first-order transition at a much larger Tc . A second-order superconducting transition emerges only at some distance from the FQCP. Finally, I discuss an extension of this scenario to the ferromagnetically ordered side.

Last modified:22 October 2012 2.31 p.m.