Breakdown of the coexistence of spin-singlet superconductivity and itinerant ferromagnetism

Details Breakdown of the coexistence of spin-singlet superconductivity and itinerant ferromagnetism Breakdown of the coexistence of spin-singlet superconductivity and itinerant ferromagnetism

2002-06-22

arxiv.org/abs/cond-mat/0206418v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.67.024514

We discuss the possibility of coexistence of spin-singlet superconductivity and ferromagnetism in a model where the same electrons are assumed responsible for both of them. Our calculations include both zero and finite momentum pairing states with both s-wave and d-wave pairing symmetry. Under the mean-field approximation, the thermodynamic potential of the non-magnetic superconducting (SC) state is shown to be always lower than that of the superconducting ferromagnetic (SF) state. It follows that the spin-singlet SF state is energetically unfavorable, and a spin-triplet SF state is more likely to survive in metals such as UGe$_{2}$ and ZrZn$_{2}$.

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