Theory of the bound state of 4f excitations and magnetic resonance in unconventional superconductors

A. Akbari; I. Eremin; P. Thalmeier; P. Fulde

doi:10.1103/PhysRevB.80.100504

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Theory of the bound state of 4f excitations and magnetic resonance in unconventional superconductors

A. Akbari, I. Eremin, P. Thalmeier, P. Fulde

DOI 10.1103/PhysRevB.80.100504 · Physical Review B

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Abstract

We analyze the influence of unconventional superconductivity on crystalline electric-field (CEF) excitations of rare-earth ions in layered superconductors. We show that resonant magnetic excitations of the conduction electrons that have been observed in these systems below Tc may result in the formation of the bound state in the 4f-electron susceptibility at energies well below the CEF excitation energy. Our results are in agreement with the observed increase of the linewidth of CEF excitations below Tc in superconducting ferropnictides and support the s± Cooper-pairing state in these compounds.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeFeAsO0.84F0.16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pr0.88LaCe0.12CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown