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Superconductivity: Commonalities in phase and mode

Nature Materials, ISSN: 1476-4660, Vol: 8, Issue: 4, Page: 253-255
2009
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Muon and neutron experiments on the new FeAs-based superconductors reveal that phase diagrams and spin excitation modes are similar to various unconventional superconductors. Muon spin relaxation and neutron scattering are used to detect magnetism in real (muons) and momentum (neutrons) space and provide information on static and dynamic magnetic behaviors without any application of external magnetic fields. Muon spin has excellent sensitivity to static magnetic order with random or small moments compared to neutron scattering and can determine the volume fraction of magnetically ordered regions near the phase boundaries. A muon study in the RE = Ce system near the SC/AF boundary reveals that the RE = Ce system undergoes evolution similar to RE = La. These experiments also shows that similarities are present in the dynamic response to neutron inelastic excitations observed in the SC or super-fluid state.

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