PRESSURE EFFECTS OF THE MAGNETIC-STRUCTURES OF TBNI2SI2 IN EXTERNAL FIELDS

Single crystal neutron diffraction studies of the field-induced magnet ic structures of TbNi2Si2 have been performed at 1.7 K without pressur e and under 0.7 GPa using a cryomagnetic high pressure system; Without pressure at 1.7 K four intermediate structures have been identified b etween a zero-field simple antiferromagnetic structure and a fully fer romagnetic one, Under 0.7 GPa two field-induced phases with an antipha se-type modulation along the [1 1 0] direction were newly observed abo ve 4 T, while below 3.3 T zero pressure structures are still retained. (C) 1998 Elsevier Science B.V. All rights reserved.