First-order superconducting transition near a ferromagnetic quantum critical point.
We address the issue of how triplet superconductivity emerges in an electronic system near a ferromagnetic quantum critical point (FQCP). Previous studies found that the superconducting transition is of second order, and T(c) is strongly reduced near the FQCP due to pair-breaking effects from thermal spin fluctuations. In contrast, we demonstrate that near the FQCP, the system avoids pair-breaking effects by undergoing a first order transition at a much larger T(c). A second order superconducting transition emerges only at some distance from the FQCP.
Chubukov
Andrey V
AV
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
Finkel'stein
Alexander M
AM
Haslinger
Robert
R
Morr
Dirk K
DK