Incommensurate magnetic structure of CeSi as observed by neutron diffraction |
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Authors: | P Schobinger-Papamantellos KHJ Buschow |
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Institution: | a Institut für Kristallographie and Petrographie, ETHZ, CH-8092, Zürich, Switzerland b Philips Research Laboratories, 5600, JA Eindhoven, The Netherlands |
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Abstract: | The magnetic ordering of the orthorhombic compound CeSi (Pama space group, FeB type of structure, Z = 4) Tn = 5.6 K was investigated by means of powder neutron diffraction in the temperatures 1.5 and 10 K. Our results show that the magnetic ordering is associated with a three dimensionally amplitude-modulated phase which is incommensurate with the crystal lattice with wave vector q = (qχ,qy,qz). The ordered Ce3+ moments are confined to the plane (a,b) at an angle of 16.7° with the b direction. It follows from the present data analysis that the dominant wave vector component is qz, which approximately corresponds to a transversal modulation, however the incommensurateness involves also the qx and qy components. The amplitude of the sine wave is μ0j = 1.667μB at 1.5 K which corresponds to quite a reduced ordered moment value compared to the Ce3+ free ion value gJ = 2.14μB. |
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