Spin-reorientation in GdGa |
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| Authors: | R A Susilo J M Cadogan D H Ryan N R Lee-Hone R Cobas S Muñoz-Pérez |
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| Institution: | 1. School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, Canberra, BC 2610, Australia
2. Department of Physics, McGill University, Montreal, QC, H3A2T8, Canada
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| Abstract: | We have determined the magnetic structure of the intermetallic compound GdGa by 155Gd Mössbauer spectroscopy and neutron powder diffraction. This compound crystallizes in the orthorhombic (Cmcm) CrB-type structure. It orders ferromagnetically at T c ?=?190(2) K and then undergoes a spin reorientation at T SR ?=?68(2) K. Between T c and T SR , the magnetic structure is characterized by ferromagnetic order of the Gd moments along the b-axis. On cooling below T SR , the Gd 4c magnetic moments split into two groups (2:2). At 3.6 K, the Gd moment is 6.7(4) μ B , and the Gd magnetic moments are in the bc-plane, canted by 84(3)° and 46(4)° with respect to the crystallographic b-axis. This splitting into two magnetically inequivalent sites is confirmed by our 5 K 155Gd Mössbauer results. |
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