Bound state of 4$f$-excitation and magnetic resonance in unconventional superconductors

Details Bound state of 4$f$-excitation and magnetic resonance in unconventional superconductors Bound state of 4$f$-excitation and magnetic resonance in unconventional superconductors

2009-02-26

arxiv.org/abs/0902.4591v1

Phys. Rev. B 80, 100504(R) (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.80.100504

We analyze the influence of unconventional superconductivity on crystalline electric field (CEF) excitations of rare earth ions in novel superconductors. We show that resonant magnetic excitations of the conduction electrons that have been observed in these systems below T$_c$ may result in the formation of the bound state in the 4$f$-electron susceptibility. This occurs at energies well below the CEF excitation energy. The effect is discussed as a function of temperature and the strength of the coupling between the 4$f$ and $d$-electrons. We argue that these effects may be present in the layered cuprates and ferropnictides which contain rare-earth ions.

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