FePS3: A first-order phase transition in a “2D” Ising antiferromagnet
1984; Elsevier BV; Volume: 46; Issue: 1-2 Linguagem: Inglês
10.1016/0304-8853(84)90355-x
ISSN1873-4766
AutoresPer Jernberg, S. Bjarman, R. Wäppling,
Tópico(s)Inorganic Chemistry and Materials
ResumoThe layer compound FePS3 has been investiged using Mössbauer spectroscopy (5 K < T < 300 K), susceptibility measurements (5 K < T < 300 K) and X-ray diffraction (90 K < T < 300 K). FePS3 is found to become antiferromagnetic below 120 K. The magnetic transition is of first-order. At the Néel temperature also a structural transition occurs, characterized by the discontinuous change in the lattice parameters. This behaviour is explained within a magnetoelastic model which is an extension of the one by Bean and Rodbell. Some of the electronic parameters of the Fe ion have been deduced, mainly from the susceptibility data. The ground state of the ion is found to be an orbital doublet well separated from excited states. The spins within the doublet are in an unique direction. The different components of the magnetic hyperfine field have also been calculated.
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