It is hard to search for materials by their properties in general and I am tryin

Question

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).

Explanation / Answer

If you take a magnetic-nonmagnetic alloy system (maybe iron-aluminum for example), the Curie temperature presumably changes continuously from above-room-temperature to absolute zero, as you change the composition from pure iron towards pure aluminum. Apart from the problem of inhomogeneities (and superconductivity), one imagines you can get even 0.0001K curie temperature. [Getting an arbitrary metal alloy may not be so easy though.
YNi3 has a curie temperature of 30 to 35 kelvin. (Ref1 Ref2)

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