A. E. Taylor, R. A. Ewings, T. G. Perring, D. R. Parker, J. Ollivier, S. J. Clarke, A. T. Boothroyd
We report neutron inelastic scattering measurements on the normal and superconducting states of polycrystalline LaFePO and Sr2ScO3FeP. Special attention is paid to the energy and wave vector at which a spin resonance might be expected, but no evidence is found for any magnetic fluctuations in the spectrum of either material in the energy and wave vector ranges probed. We estimate that the magnetic signal, if present, is at least a factor of four (Sr2ScOFeP) or seven (LaFePO) smaller than in the related iron arsenide and chalcogenide superconductors. These results suggest that magnetic fluctuations are not as intimately connected to superconductivity in the iron phosphide superconductors as they are in other iron-based superconductors.
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http://arxiv.org/abs/1302.5057
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