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Magnetic interplay of Mn and Yb sites in YbMn2Si2 ¿ Crystal field splitting

Journal Article


Abstract


  • The crystal field splitting of YbMn2Si2 has been investigated over the temperature range 5–65 K using inelastic neutron scattering at a wavelength of 2.345 Å (resolution 800 μeV; dynamic range ∼10 meV). The excitation spectra have been analysed using a crystal field model above and below TN2, the temperature at which the collinear antiferromagnetic structure AFil transforms to the low-temperature structure in which the magnetic cell is doubled along the c-axis (TN1 = 526(4) K > T > TN2 = 32(2) K). The calculated excitation spectra show good agreement with the observed spectra for the unique environment of Yb3+ ions in the collinear antiferromagnetic structure AFil above TN2 and for the inequivalent sites of Yb3+ ions below TN2. This agreement has been obtained with a model for the low-temperature region in which a molecular field with optimal components in the x, y and z directions of Bx = 13.5 T, By = 65 T, Bz = 21.3 T is included. The pronounced components in the x and y directions are discussed in relation to the significant contraction of ∼0.1% of the c lattice parameter below the TN2 magnetic transition.

Publication Date


  • 2020

Citation


  • Mole, R. A., Cortie, D. L., Hofmann, M., Wang, J., Hutchison, W. D., Yu, D., . . . Campbell, S. J. (2020). Magnetic interplay of Mn and Yb sites in YbMn2Si2 ¿ Crystal field splitting. Journal of Alloys and Compounds, 845. doi:10.1016/j.jallcom.2020.155316

Scopus Eid


  • 2-s2.0-85087359165

Volume


  • 845

Abstract


  • The crystal field splitting of YbMn2Si2 has been investigated over the temperature range 5–65 K using inelastic neutron scattering at a wavelength of 2.345 Å (resolution 800 μeV; dynamic range ∼10 meV). The excitation spectra have been analysed using a crystal field model above and below TN2, the temperature at which the collinear antiferromagnetic structure AFil transforms to the low-temperature structure in which the magnetic cell is doubled along the c-axis (TN1 = 526(4) K > T > TN2 = 32(2) K). The calculated excitation spectra show good agreement with the observed spectra for the unique environment of Yb3+ ions in the collinear antiferromagnetic structure AFil above TN2 and for the inequivalent sites of Yb3+ ions below TN2. This agreement has been obtained with a model for the low-temperature region in which a molecular field with optimal components in the x, y and z directions of Bx = 13.5 T, By = 65 T, Bz = 21.3 T is included. The pronounced components in the x and y directions are discussed in relation to the significant contraction of ∼0.1% of the c lattice parameter below the TN2 magnetic transition.

Publication Date


  • 2020

Citation


  • Mole, R. A., Cortie, D. L., Hofmann, M., Wang, J., Hutchison, W. D., Yu, D., . . . Campbell, S. J. (2020). Magnetic interplay of Mn and Yb sites in YbMn2Si2 ¿ Crystal field splitting. Journal of Alloys and Compounds, 845. doi:10.1016/j.jallcom.2020.155316

Scopus Eid


  • 2-s2.0-85087359165

Volume


  • 845