A FE-57 HIGH-PRESSURE MOSSBAUER STUDY OF THE FERROMAGNETIC INTERMETALLIC COMPOUND GD2FE17

The effect of pressure up to 5.5 GPa on the magnetic behaviour of Gd2F e17 has been investigated using the Fe-57 high-pressure Mossbauer effe ct technique. We show that the decrease of the average magnetic hyperf ine field at 300 K can be well explained by the decrease of Curie temp erature with pressure, while the Fe local magnetic moment remains almo st stable in this pressure range. The decrease of the isomer shift wit h increasing pressure indicates a corresponding increase of the select ron density at the Fe-57 nucleus, which is mainly caused by the volume compression of the 4s conduction electrons.