It is hard to search for materials by their properties in general and I am trying to find a material with a very low Curie temperature. At the moment I am browsing different sites but can only find a number of 'normal' ferromagnetic materials but few with a small Curie temperature.
So which material has the lowest Curie of all ferromagnets?
(By material I mean pure substance, e.g. NdFeB, but not a material under pressure, or nanocrystals or other special conditions which should all allow the suppression of ferromagnetism).