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Magnetic phase diagram and multiferroicity of Ba3MnNb2O9 : A spin - 52 triangular lattice antiferromagnet with weak easy-axis anisotropy

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [4];  [4];  [4];  [5];  [3];  [6]
  1. Florida State Univ., Tallahassee, FL (United States). Dept of Physics; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Southeast Univ., Nanjing (China). Dept. of Physics
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  5. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  6. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Here we have performed magnetic, electric, thermal and neutron powder diffraction (NPD) experiments as well as density functional theory (DFT) calculations on Ba3MnNb2 O9. All results suggest that Ba3MnNb2 O9 is a spin-5/2 triangular lattice antiferromagnet (TLAF) with weak easy-axis anisotropy. At zero field, we observed a narrow two-step transition at TN1 = 3.4 K and TN2 = 3.0 K. The neutron diffraction measurement and the DFT calculation indicate a 120 spin structure in ab plane with out-of-plane canting at low temperatures. With increasing magnetic field, the 120 spin structure evolves into up-up-down (uud) and oblique phases showing successive magnetic phase transitions, which fits well to the theoretical prediction for the 2D Heisenberg TLAF with classical spins. Ultimately, multiferroicity is observed when the spins are not collinear but suppressed in the uud and oblique phases.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1185768
Alternate ID(s):
OSTI ID: 1181500
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 90; ISSN 1098-0121; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Magnetic field-temperature phase diagram of multiferroic (NH4)2FeCl5·H2O journal August 2019
Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology journal November 2015
Magnetism driven by the interplay of fluctuations and frustration in the easy-axis triangular XXZ model with transverse fields journal October 2019
Ultrahigh magnetic field phases in the frustrated triangular-lattice magnet CuCrO 2 journal November 2017
Exotic Magnetic Field-Induced Spin-Superstructures in a Mixed Honeycomb-Triangular Lattice System journal February 2019
Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology text January 2015
Exotic magnetic field-induced spin-superstructures in a mixed honeycomb triangular lattice system text January 2018

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