Abstract
The pressure dependence of the magnetic transitions in the giant magnetocaloric materials has been investigated using x-ray magnetic circular dichroism (XMCD) measurements in a diamond anvil cell (DAC). We found that the most notable features of the phase diagram are also present in the phase diagram. These include a nearly linear increase in Curie temperature, , with increasing both and up to , and a discontinuity accompanied by a change in slope, , at this temperature. However, the results indicate that a similar volume change results in times larger increase in with Si doping than with pressure. Si doping, hence, does more to stabilize ferromagnetic interactions than simply uniformly reducing the unit cell volume.
- Received 27 April 2007
DOI:https://doi.org/10.1103/PhysRevB.76.014411
©2007 American Physical Society