Superconductivity: Exotic Commonalities in Phase and Mode

Abstract

Recent muon and neutron experiments on the new FeAs-based superconductors revealed phase diagrams characterized by first-order evolution from antiferromagnetic to superconducting states, and an inelastic magnetic resonance mode whose energy scales as $\sim 4k_B{T}_c$. These features exhibit striking commonalities with cuprate, backyball, organic, and heavy-fermion superconductors as well as superfluid ${}^4$He.

4 pages, 2 figures, original version of News and Views for Nature Materials submitted on Feb. 8, 2009; revised version will appear as Nature Materials 8 (April, 2009) 253-255

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• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
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• Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation
• Spin resonance in the d-wave superconductor CeCoIn5
• Coexistence of antiferromagnetism and superconductivity in CeRhIn5 under high pressure and magnetic field
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