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Title: Magnetic phase diagram and multiferroicity of Ba 3 MnNb 2 O 9 : A spin - 5 2 triangular lattice antiferromagnet with weak easy-axis anisotropy

Here we have performed magnetic, electric, thermal and neutron powder diffraction (NPD) experiments as well as density functional theory (DFT) calculations on Ba 3MnNb 2 O 9. All results suggest that Ba 3MnNb 2 O 9 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 T N1 = 3.4 K and T N2 = 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.
Authors:
 [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)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; NSF-DMR-1157490; 51322206; 2011CB922101; NSF-DMR-1350002
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 22; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1185768
Alternate Identifier(s):
OSTI ID: 1181500

Lee, M., Choi, E. S., Huang, X., Ma, J., Dela Cruz, C. R., Matsuda, M., Tian, W., Dun, Z. L., Dong, S., and Zhou, H. D.. Magnetic phase diagram and multiferroicity of Ba3MnNb2O9 : A spin -52 triangular lattice antiferromagnet with weak easy-axis anisotropy. United States: N. p., Web. doi:10.1103/PhysRevB.90.224402.
Lee, M., Choi, E. S., Huang, X., Ma, J., Dela Cruz, C. R., Matsuda, M., Tian, W., Dun, Z. L., Dong, S., & Zhou, H. D.. Magnetic phase diagram and multiferroicity of Ba3MnNb2O9 : A spin -52 triangular lattice antiferromagnet with weak easy-axis anisotropy. United States. doi:10.1103/PhysRevB.90.224402.
Lee, M., Choi, E. S., Huang, X., Ma, J., Dela Cruz, C. R., Matsuda, M., Tian, W., Dun, Z. L., Dong, S., and Zhou, H. D.. 2014. "Magnetic phase diagram and multiferroicity of Ba3MnNb2O9 : A spin -52 triangular lattice antiferromagnet with weak easy-axis anisotropy". United States. doi:10.1103/PhysRevB.90.224402. https://www.osti.gov/servlets/purl/1185768.
@article{osti_1185768,
title = {Magnetic phase diagram and multiferroicity of Ba3MnNb2O9 : A spin -52 triangular lattice antiferromagnet with weak easy-axis anisotropy},
author = {Lee, M. and Choi, E. S. and Huang, X. and Ma, J. and Dela Cruz, C. R. and Matsuda, M. and Tian, W. and Dun, Z. L. and Dong, S. and Zhou, H. D.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.90.224402},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 90,
place = {United States},
year = {2014},
month = {12}
}

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