Physical properties of the quasi-two-dimensional square lattice antiferromagnet Ba2FeSi2O7
- Pohang Univ. of Science and Technology (POSTECH) (South Korea)
- Pohang Univ. of Science and Technology (POSTECH) (South Korea); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Pohang Univ. of Science and Technology (POSTECH) (South Korea); Pohang Univ. of Science and Technology (POSTECH) (South Korea). Lab. for Pohang Emergent Materials and Department of Physics; Rutgers Univ., Piscataway, NJ (United States). Rutgers Center for Emergent Materials
In this work, we report magnetization (χ, ), magnetic specific heat ( ), and neutron powder diffraction results on a quasi-two-dimensional (2D) square lattice antiferromagnet consisting of tetrahedrons with highly compressive tetragonal distortion (27%). Despite of the quasi-2D lattice structure, both χ and present three-dimensional magnetic long-range ordering below the Néel temperature . Neutron diffraction data show a collinear (1,0,1/2) antiferromagnetic (AFM) structure below but the ordered moment aligned in the plane is suppressed by 26% from the ionic spin value ( ). Both the AFM structure and the suppressed moments are well explained by using Monte Carlo simulations with a large single-ion in-plane anisotropy .4 meV and a rather small Heisenberg exchange .15 meV in the plane. The characteristic 2D spin fluctuations are recognized in the magnetic entropy release and diffuse scattering above . This new quasi-2D magnetic system also displays unusual nonmonotonic dependence of as a function of magnetic field .
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); POSTECH
- Grant/Contract Number:
- AC05-00OR22725; 2016K1A4A4A01922028; 2020M3H4A2084418; FG02-07ER46382
- OSTI ID:
- 1841485
- Alternate ID(s):
- OSTI ID: 1837598
- Journal Information:
- Physical Review B, Vol. 104, Issue 21; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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