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Crystals and magnetic structure of RMn2Si2 (R = Pr, Nd, Y) and YMn2Ge2
Authors:S Siek  A Szytuła  J Leciejewicz
Institution:Instutute of Physics, Jagiellonian University, 30-059 Kraków, Poland;Institute of Nuclear Research, S?wierk Research Establishment, 05-400 Otwock, Poland
Abstract:Crystallographic and magnetic properties of PrMn2Si2, NdMn2Si2, YMn2Si2 and YMn2Ge2 intermetallics were studied by X-ray, neutron diffraction and magnetometric measurements. The crystal structure of all four compounds was confirmed to be body-centered tetragonal (space group I4/mmm). All were found to be antiferromagnetic with Néel points at 368, 380, 460 and 395 K respectively. Neutron diffraction results indicate that their magnetic structure consists of ferromagnetic layers composed of Mn ions piled up along the c-axis. Each layer is antiferromagnetically coupled to adjacent layer. The magnetic space group is Ip4/mmm′. No magnetic ordering of the R sublattice was observed at 1.8 K in the case of R = Pr and Nd.
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