Universal relation between magnetic resonance and superconducting gap in unconventional superconductors

Details Universal relation between magnetic resonance and superconducting gap in unconventional superconductors Universal relation between magnetic resonance and superconducting gap in unconventional superconductors

2009-03-12

arxiv.org/abs/0903.2291v1

Physics

Condensed Matter

Superconductivity

19 pages, 5 figures, 2 tables

Scientific paper

Unconventional superconductors such as the high-transition temperature cuprates, heavy-fermion systems and iron arsenide-based compounds exhibit antiferromagnetic fluctuations that are dominated by a resonance, a collective spin-one excitation mode in the superconducting state. Here we demonstrate the existence of a universal linear relation, $Er \propto 2\Delta$, between the magnetic resonance energy (Er) and the superconducting pairing gap ($\Delta$), spanning two orders of magnitude in energy. This relation is valid for materials that range from being close to the Mott-insulating limit to being on the border of itinerant magnetism. Since the common excitonic picture of the resonance has not led to such universality, our observation suggests a much deeper connection between antiferromagnetic fluctuations and unconventional superconductivity.

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