Abstract
The magnetic properties of polycrystalline samples of RAgSi compounds have been investigated by neutron diffraction, magnetization and DC susceptibility measurements over the temperature range from 1.5 to 300 K. All title compounds are antiferromagnetic at low temperatures. Neutron diffraction data collected above the respective Néel points confirm that they crystallize in the hexagonal ZrNiAl-type structure. The magnetic structure of TbAgSi has not been determined due to the complexity of the neutron diffraction patterns recorded at low temperatures. The antiferromagnetic structures of DyAgSi, HoAgSi and ErAgSi are described, each by the propagation vector k=[k x, k x, 0] with k x =0.3311(13), 0.3326(7) and 0.5012(28), respectively. The Néel temperatures are 13.4 K in GdAgSi (from the magnetometric measurements), 21.5 K in TbAgSi, 11 K in DyAgSi, 10 K in HoAgSi and 2.6 K in ErAgSi. Magnetization measurements carried out in the temperature range from 4 to 30 K in the presence of external magnetic fields up to 120 kOe show that the metamagnetic phase transitions are induced in GdAgSi, TbAgSi, DyAgSi and HoAgSi.
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