Weak Ferromagnetism in Superconducting ErNi2B2C
We review our recent studies on ErNi2B2C, in which a microscopic coexistence of weak ferromagnetism (WFM) and superconductivity was confirmed for the first time by polarized neutron diffraction measurements. A detailed spin arrangement of ferromagnetic (FM) components is also discussed based on the results of unpolarized neutron diffraction experiments. Furthermore, we found that a temperature dependence of the lower critical field H Cr shows a clear upturn at the WFM ordering temperature, which indicates a cooperative interplay between FM and superconductivity. Finally, we shall discuss a possibility of a realization of a spontaneous vortex phase in this system.
KeywordsVortex Anisotropy Nitrides
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