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Low-temperature magnetic structures in the DySi FeB-type compound 27.03.09 by P. Schobinger-Papamantellos; K.H.J. Buschow; J. Rodríguez-Carvajal; C. Ritter is a Materials Science article available to read on EtoBox.

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The low-temperature magnetic ordering of the dimorphic DySi compound has been studied at 1.5 K by neutron diffraction on two polycrystalline samples. The samples comprise various amounts of the two orthorhombic modifications: CrB-type (Cmcm Nr. 63, all atoms at 4c site: (0, y, 1 4 )) and FeB-type (Pnma Nr. 62, all atoms at 4c site: (x, 1 4 , z)), both order antiferromagnetically (T N E38 K). The CrB-type phase orders with a uniaxial structure with the wave vector q 1 1⁄4 (0, 0, 1 2 ) requiring a doubling of the c-axis. The Dy moments point along the linear chain with the shortest distance c. At 1.5 K, the ordered moment value is 8.57(1) m B /Dy atom. Two symmetry independent wave vectors describe the 1.5 K magnetic ordering of the FeB-type phase: q 2 1⁄4 (0, 1 2 , 1 6 ) and q 3 1⁄4 (0, 0.484(1), 0.0892(1)), coexisting in form of domains. In both structures the magnetic moments are confined to the (0 0 1) plane at an angle of 2(2)1 and 22(3)1 from the shortest axis b, respectively. Both structures correspond to sine wave modulations. The amplitude of the q 2 wave is m o 1⁄4 7.5(1) m B /Dy atom and that of q 3 8.2(1) m B /Dy atom. The wave vector q 2 when referring to the (a, 2b, c)

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Author

P. Schobinger-Papamantellos; K.H.J. Buschow; J. Rodríguez-Carvajal; C. Ritter

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-8853)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)