Ferromagnetic superconductivity driven by changing Fermi surface topology

Details Ferromagnetic superconductivity driven by changing Fermi surface topology Ferromagnetic superconductivity driven by changing Fermi surface topology

2002-10-24

arxiv.org/abs/cond-mat/0210552v2

Phys. Rev. Lett. 90, 167005 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 9 figures, REVTeX 4. Version 2: updated references and corrected typos

Scientific paper

10.1103/PhysRevLett.90.167005

We introduce a simple but powerful zero temperature Stoner model to explain the unusual phase diagram of the ferromagnetic superconductor, UGe2. Triplet superconductivity is driven in the ferromagnetic phase by tuning the majority spin Fermi level through one of two peaks in the paramagnetic density of states (DOS). Each peak is associated with a metamagnetic jump in magnetisation. The twin peak DOS may be derived from a tight-binding, quasi-one-dimensional bandstructure, inspired by previous bandstructure calculations.

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