Magnetic structure and magnon dynamics of the quasi-two-dimensional antiferromagnet FePS3

被引:168
作者
Lancon, D. [1 ,2 ]
Walker, H. C. [3 ]
Ressouche, E. [4 ]
Ouladdiaf, B. [1 ]
Rule, K. C. [5 ]
McIntyre, G. J. [5 ]
Hicks, T. J. [6 ]
Ronnow, H. M. [2 ]
Wildes, A. R. [1 ]
机构
[1] Inst Laue Langevin, CS 20156, F-38042 Grenoble 9, France
[2] Ecole Polytech Fed Lausanne, SB ICMP LQM, CH-1015 Lausanne, Switzerland
[3] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[4] CEA Grenoble INAC, Lab MDN, 17 Rue Martyrs, F-38054 Grenoble 9, France
[5] Australian Nucl Sci & Technol Org, Locked Bag 2001, Kirrawee Dc, NSW 2232, Australia
[6] Monash Univ, Sch Phys, Box 27, Clayton, Vic 3800, Australia
关键词
POLARIZATION ANALYSIS; NEUTRON; TRANSITION; CRYSTAL; LAYERS; MNPS3; VISUALIZATION; SPECTROMETER; DIFFRACTION; STACKING;
D O I
10.1103/PhysRevB.94.214407
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Neutron scattering from single crystals has been used to determine the magnetic structure and magnon dynamics of FePS3, an S = 2 Ising-like quasi-two-dimensional antiferromagnet with a honeycomb lattice. The magnetic structure has been confirmed to have a magnetic propagation vector of k(M) = [01 1/2] and the moments are collinear with the normal to the ab planes. The magnon data could be modeled using a Heisenberg Hamiltonian with a single-ion anisotropy. Magnetic interactions up to the third in-plane nearest neighbor needed to be included for a suitable fit. The best fit parameters for the in-plane exchange interactions were J(1) = 1.46, J(2) = -0.04, and J(3) = -0.96 meV. The single-ion anisotropy is large, Delta = 2.66 meV, explaining the Ising-like behavior of the magnetism in the compound. The interlayer exchange is very small, J' = -0.0073 meV, proving that FePS3 is a very good approximation to a two-dimensional magnet.
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页数:11
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