Description
In this talk I introduce a general scheme to probe the
compatibility of arbitrary pairing states with a given normal
state Hamiltonian by the introduction of a concept called
“Superconducting Fitness”. This quantity gives a direct
measure of the suppression of the superconducting critical
temperature in the presence of key symmetry-breaking
fields. A merit of the superconducting fitness is that it can be
used as a tool to identify nontrivial mechanisms to suppress
superconductivity under various external influences, in
particular, magnetic fields or distortions, even in complex
multiorbital systems. This concept can also be used in order
to favour unusual superconducting order parameters by
engineering the normal state Hamiltonian. I discuss the
application of this idea to Sr2Ru04, Fe-based superconductors
and CePt3Si.
