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Magnetic structure and crystal field states of the heavy fermion system YbPt5B2

Leonid Salamakha1,2, Oksana Sologub1, Herwig Michor1, Dmitry Khalyavin3, Manh Duc Le3, Devashibhai T. Adroja3, and Ernst Bauer1,*

  • *Contact author: bauer@ifp.tuwien.ac.at
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Phys. Rev. B 112, 094453 – Published 26 September, 2025

DOI: https://doi.org/10.1103/pj8b-d5h9

Abstract

Monoclinic compounds YbPt5B2 and LuPt5B2 [space group C2/m (No. 12), own structure type] have been studied by means of elastic and inelastic neutron scattering experiments. The heavy fermion system YbPt5B2 orders antiferromagnetically below TN1=7.8K and exhibits an incommensurate magnetic structure with a temperature-dependent propagation vector, k⃗1=(0.194,0,−0.045;T=6K). Below TN2=4.7K, a transition into a commensurate structure, k⃗2=(0,0,0), takes place. The transition at TN2 turns out to be of first order, as obvious from commensurate and incommensurate contributions to the magnetic moments around T=TN2. Rather large Yb moments, m(Yb)>3μB, yet reduced due to the Kondo effect, were obtained as a result of the splitting of the Yb3+ eightfold-degenerate ground state into four doublets, owing to crystalline electric field (CEF) effects. Such unusually large moments in Yb systems can be explained only by an appropriate wave function ∑i=−7/2i=7/2±αi|i/2〉, ∑iαi2=1, constituting the CEF ground state doublet, which indeed was concluded from the present inelastic neutron data, considering the crystalline electric field theory. The overall CEF splitting is on the order of 44 meV, while the first excited level is located ≈25 meV above the ground state.

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Phys. Rev. B 112, 094453– Published 26 September, 2025
  • Received 22 May 2025
  • Accepted 3 September 2025
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