The Missing Link: Magnetism and Superconductivity

Details The Missing Link: Magnetism and Superconductivity The Missing Link: Magnetism and Superconductivity

2006-04-05

arxiv.org/abs/cond-mat/0604146v2

Phys. Rev. B 75, 054523 (2007)

Physics

Condensed Matter

Superconductivity

6 pages, 2 figures

Scientific paper

10.1103/PhysRevB.75.054523

The effect of magnetic moments on superconductivity has long been a controversial subject in condensed matter physics. While Matthias and collaborators experimentally demonstrated the destruction of superconductivity in La by the addition of magnetic moments (Gd), it has since been suggested that magnetic fluctuations are in fact responsible for the development of superconducting order in other systems. Currently this debate is focused on several families of unconventional superconductors including high-Tc cuprates, borocarbides as well as heavy fermion systems where magnetism and superconductivity are known to coexist. Here we report a novel aspect of competition and coexistence of these two competing orders in an interesting class of heavy fermion compounds, namely the 1-1-5 series: CeTIn5 where T=Co, Ir, or Rh. Our optical experiments indicate the existence of regions in momentum space where local moments remain unscreened. The extent of these regions in momentum space appears to control both the normal and superconducting state properties in the 1-1-5 family of heavy fermion (HF) superconductors.

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