Physics – Condensed Matter – Superconductivity
Scientific paper
2008-04-23
Phys. Rev. B 77, 184511 (2008)
Physics
Condensed Matter
Superconductivity
12 pages, 8 figures. Accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.184511
We construct a mean-field theory for itinerant ferromagnetism coexisting with a non-unitary superconducting state, where only the majority-spin band is gapped and contains line nodes, while the minority-spin band is gapless at the Fermi level. Our study is motivated by recent experimental results indicating that this may be the physical situation realized in the heavy-fermion compound UGe$_2$. We investigate the stability of the mean-field solution of the magnetic and superconducting order parameters. Also, we provide theoretical predictions for experimentally measurable properties of such a non-unitary superconductor: the specific heat capacity, the Knight shift, and the tunneling conductance spectra. Our study should be useful for direct comparison with experimental results and also for further predictions of the physics that may be expected in ferromagnetic superconductors.
Cuoco Mario
Linder Jacob
Nevidomskyy Andriy
Sperstad Iver B.
Sudbø Asle
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