We have studied the complex magnetic ordering of the Dy sublattices in orthorhombic Dy3Ag4Sn4 by high-resolution neutron diffraction and Sn-119 Mossbauer spectroscopy. Magnetic ordering in this compound occurs over two transitions. At 16 K the Dy( 2d) site orders in a doubled commensurate antiferromagnetic structure described by a propagation vector [ 0 1 2 0], with moments aligned along [ 100]. The Dy( 4e) site orders incommensurately with a propagation vector [ 0 0.628( 1) 0] and moments in the ( 001) plane. Below the second transition at 14 K both Dy site ordering modes are commensurate antiferromagnetic with the propagation vector [ 0 1 2 0] and unchanged ordering directions. The Sn-119 Mossbauer spectra comprise three magnetically split sextets in the area ratio 50%: 25%: 25% due to transferred hyperfine fields at the Sn-119 nuclei from the surrounding magnetic Dy neighbours. This spectral decomposition deviates from the area ratio 50%: 50% expected on the basis of the crystal structure and is in perfect agreement with the magnetic structure of Dy3Ag4Sn4 deduced from neutron diffraction data.

Complex antiferromagnetic ordering in Dy3Ag4Sn4

CANEPA, FABIO MICHELE;NAPOLETANO, MYRTA;RIANI, PAOLA
2006-01-01

Abstract

We have studied the complex magnetic ordering of the Dy sublattices in orthorhombic Dy3Ag4Sn4 by high-resolution neutron diffraction and Sn-119 Mossbauer spectroscopy. Magnetic ordering in this compound occurs over two transitions. At 16 K the Dy( 2d) site orders in a doubled commensurate antiferromagnetic structure described by a propagation vector [ 0 1 2 0], with moments aligned along [ 100]. The Dy( 4e) site orders incommensurately with a propagation vector [ 0 0.628( 1) 0] and moments in the ( 001) plane. Below the second transition at 14 K both Dy site ordering modes are commensurate antiferromagnetic with the propagation vector [ 0 1 2 0] and unchanged ordering directions. The Sn-119 Mossbauer spectra comprise three magnetically split sextets in the area ratio 50%: 25%: 25% due to transferred hyperfine fields at the Sn-119 nuclei from the surrounding magnetic Dy neighbours. This spectral decomposition deviates from the area ratio 50%: 50% expected on the basis of the crystal structure and is in perfect agreement with the magnetic structure of Dy3Ag4Sn4 deduced from neutron diffraction data.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/217242
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