Subject: Magnetism causing a material to heat up or cool off.

A number of years back I read about a material which either got hot or cold (I 
can't remember which) when placed in a strong magnetic field.  As I remember 
the temperature change was significant.  I haven't been able to find anything 
about this material since.  I was wondering if anyone has heard of this?  If my 
memory serves me correctly the material was some kind of alloy or mixture of 
materials possibly similar to some of the high temperature superconductors.  I 
would appreciate any help you can give me.
Thanks; Milton Wall

Re: Magnetism causing a material to heat up or cool off.