Crystal Field Effects in Magnetic Superconductors
For the materials which have been found to simultaneously exhibit magnetic and superconducting properties, the magnetic ordering (of the rare earth ions) typically occurs below 1K, Since the associated magnetic energies are necessarily small we can anticipate that a proper understanding of the magnetic properties of these systems must include the effects of the crystalline electric field. In this paper we review the neutron scattering experiments carried out to date at the National Bureau of Standards research reactor on the Chevrel phase superconductors REMo6Se8, REMo6S8 (RE=rare earth) and on the substitutional alloy system (Ce1−cHoc)Ru2, with particular attention being given to the crystal field effects. The crystal field splittings in these systems are in fact generally found to be large in comparison with the characteristic magnetic energies and consequently the nature of the magnetic state at low temperatures and its influence on the superconducting properties is dictated primarily by the crystal field ground state.
KeywordsEntropy Anisotropy Graphite Sulfide Assure
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