Magnetic phase diagram and multiferroicity of : A spin - triangular lattice antiferromagnet with weak easy-axis anisotropy
- Florida State Univ., Tallahassee, FL (United States). Dept of Physics; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Southeast Univ., Nanjing (China). Dept. of Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
- 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 Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; NSF-DMR-1157490; 51322206; 2011CB922101; NSF-DMR-1350002
- OSTI ID:
- 1185768
- Alternate ID(s):
- OSTI ID: 1181500
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 22; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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