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.
KeywordsNeutron Diffraction Spin Density Wave Weak Ferromagnetism Meissner Effect Neutron Diffraction Experiment
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- 3.For a review, see O. Fischer, Ferromagnetic Materials (Vol. 5, Eds. K. H. J. Buschow and E. P. Wohlfarth, Holland, Amsterdam, 1990).Google Scholar
- 7.H. Kawano-Furukawa et al., submitted to PRL.Google Scholar
- 9.G. E. Bacon, Neutron Diffraction, 3rd ed. (Clarendon Oxford, 1975).Google Scholar