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19 April 2024 |
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Superconductivity from emerging magnetic moments | | Shintaro Hoshino
; Philipp Werner
; | | Date: |
27 Mar 2015 | | Abstract: | A growing body of theoretical work shows that the Hund coupling in materials
with multiple active orbitals leads to interesting correlation effects and that
this physics is important for understanding the properties of ruthenates and
iron pnictides. These so-called Hund metals exhibit large mass enhancements
without Hubbard bands, and many show characteristic non-Fermi liquid
properties. The underlying phenomenon is spin-freezing: In a rather narrowly
defined range of fillings and interaction strengths, long-lived magnetic
moments appear in the metal phase. Here, we show that the fluctuating local
moments at the border of the spin-frozen regime induce spin-triplet
superconductivity at low temperature. The resulting phase diagram features a
superconducting dome below a non-Fermi liquid metallic region and next to a
magnetically ordered phase. We suggest that this type of fluctuating-moment
induced superconductivity, which is not related to a quantum critical point,
may be realized in spin-triplet superconductors such as Sr2RuO4 and the uranium
compounds UGe2, UCoGe and URhGe. | | Source: | arXiv, 1503.8164 | | Services: | Forum | Review | PDF | Favorites | |
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