4.6 Article

Physical properties of the quasi-two-dimensional square lattice antiferromagnet Ba2FeSi2O7

期刊

PHYSICAL REVIEW B
卷 104, 期 21, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.214434

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资金

  1. Max Planck POSTECH/Korea Research Initiative, Study for Nano Scale Optomaterials and Complex Phase Materials [2016K1A4A4A01922028]
  2. National Research Foundation (NRF) - MSIP of Korea [2020M3H4A2084418]
  3. U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
  4. National Science Foundation [DMR 1157490]
  5. State of Florida
  6. U.S. Department of Energy
  7. National Institute of Standards and Technology, U.S. Department of Commerce
  8. U.S. DOE [DOE: DE-FG02-07ER46382]
  9. National Research Foundation of Korea [2020M3H4A2084418] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The study found that a quasi-two-dimensional square lattice antiferromagnet with highly compressive tetragonal distortion exhibits three-dimensional magnetic long-range ordering. Neutron diffraction data shows a collinear antiferromagnetic structure below the Neel temperature, but the aligned magnetic moment in the ab plane is suppressed, which can be well explained by Monte Carlo simulations.
We report magnetization (chi, M), magnetic specific heat (C-M), and neutron powder diffraction results on a quasi-two-dimensional (2D) S = 2 square lattice antiferromagnet Ba2FeSi2O7 consisting of FeO4 tetrahedrons with highly compressive tetragonal distortion (27%). Despite of the quasi-2D lattice structure, both chi and C-M present three-dimensional magnetic long-range ordering below the Neel temperature T-N = 5.2 K. Neutron diffraction data show a collinear Q(m) =(1,0,1/2) antiferromagnetic (AFM) structure below T-N but the ordered moment aligned in the ab plane is suppressed by 26% from the ionic spin S = 2 value (4 mu(B)). Both the AFM structure and the suppressed moments are well explained by using Monte Carlo simulations with a large single-ion in-plane anisotropy D = 1.4 meV and a rather small Heisenberg exchange J(intra) = 0.15 meV in the plane. The characteristic 2D spin fluctuations are recognized in the magnetic entropy release and diffuse scattering above T-N. This new quasi-2D magnetic system also displays unusual nonmonotonic dependence of T-N as a function of magnetic field H.

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