Ba8MnNb6 O24: A model two-dimensional spin- 52 triangular lattice antiferromagnet

R. Rawl; L. Ge; Z. Lu; Z. Evenson; C. R. Dela Cruz; Q. Huang; M. Lee; E. S. Choi; M. Mourigal; H. D. Zhou; J. Ma

doi:10.1103/PhysRevMaterials.3.054412

Ba8MnNb6 O24: A model two-dimensional spin- 52 triangular lattice antiferromagnet

R. Rawl, L. Ge, Z. Lu, Z. Evenson, C. R. Dela Cruz, Q. Huang, M. Lee, E. S. Choi, M. Mourigal, H. D. Zhou, J. Ma

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Abstract

We successfully synthesized and characterized the triangular lattice antiferromagnet Ba8MnNb6O24, which comprises equilateral spin-52Mn2+ triangular layers separated by six nonmagnetic Nb5+ layers. The detailed susceptibility, specific heat, elastic and inelastic neutron scattering measurements, and spin-wave theory simulation on this system reveal that it has a 120 ordering ground state below TN=1.45K with in-plane nearest-neighbor exchange interaction ≈0.11meV. While the large separation 18.9 Å between magnetic layers makes the interlayer exchange interaction virtually zero, our results suggest that a weak easy-plane anisotropy is the driving force for the km=(1/3,1/3,0) magnetic ordering. The magnetic properties of Ba8MnNb6O24, along with its classical excitation spectra, contrast with the related triple perovskite Ba3MnNb2O9, which shows easy-axis anisotropy, and the isostructural compound Ba8CoNb6O24, in which the effective spin-12Co2+ spins do not order down to 60 mK and in which the spin dynamics shows signs of strong quantum effects.

Original language	English
Article number	054412
Journal	Physical Review Materials
Volume	3
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevMaterials.3.054412
State	Published - May 28 2019

Funding

J.M. gratefully acknowledges the support from the Chinese Spallation Neutron Source (CSNS) User Special Grant, the NSF China (11774223), and the Ministry of Science and Technology of China (2016YFA0300500). R.R., Q.H., and H.D.Z. gratefully acknowledge the support from NSF-DMR through Award No. DMR-1350002. The work at Georgia Tech (L.G. and M.M.) was supported by the National Science Foundation through Grant No. NSF-DMR-1750186. This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. A portion of this work was performed at the NHMFL, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. E.S.C. and M.L. acknowledge the support from NSF-DMR-1309146.

Funders	Funder number
CSNS
Chinese Spallation Neutron Source
Ministry of Science and Technology of China	2016YFA0300500
NSF China	11774223
NSF-DMR
NSF-DMR-1309146
National Science Foundation
Directorate for Mathematical and Physical Sciences	1157490, 1309146
Georgia Institute of Technology

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title = "Ba8MnNb6 O24: A model two-dimensional spin- 52 triangular lattice antiferromagnet",

abstract = "We successfully synthesized and characterized the triangular lattice antiferromagnet Ba8MnNb6O24, which comprises equilateral spin-52Mn2+ triangular layers separated by six nonmagnetic Nb5+ layers. The detailed susceptibility, specific heat, elastic and inelastic neutron scattering measurements, and spin-wave theory simulation on this system reveal that it has a 120 ordering ground state below TN=1.45K with in-plane nearest-neighbor exchange interaction ≈0.11meV. While the large separation 18.9 {\AA} between magnetic layers makes the interlayer exchange interaction virtually zero, our results suggest that a weak easy-plane anisotropy is the driving force for the km=(1/3,1/3,0) magnetic ordering. The magnetic properties of Ba8MnNb6O24, along with its classical excitation spectra, contrast with the related triple perovskite Ba3MnNb2O9, which shows easy-axis anisotropy, and the isostructural compound Ba8CoNb6O24, in which the effective spin-12Co2+ spins do not order down to 60 mK and in which the spin dynamics shows signs of strong quantum effects.",

author = "R. Rawl and L. Ge and Z. Lu and Z. Evenson and {Dela Cruz}, {C. R.} and Q. Huang and M. Lee and Choi, {E. S.} and M. Mourigal and Zhou, {H. D.} and J. Ma",

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doi = "10.1103/PhysRevMaterials.3.054412",

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T2 - A model two-dimensional spin- 52 triangular lattice antiferromagnet

AU - Rawl, R.

AU - Ge, L.

AU - Lu, Z.

AU - Evenson, Z.

AU - Dela Cruz, C. R.

AU - Huang, Q.

AU - Lee, M.

AU - Choi, E. S.

AU - Mourigal, M.

AU - Zhou, H. D.

AU - Ma, J.

PY - 2019/5/28

Y1 - 2019/5/28

N2 - We successfully synthesized and characterized the triangular lattice antiferromagnet Ba8MnNb6O24, which comprises equilateral spin-52Mn2+ triangular layers separated by six nonmagnetic Nb5+ layers. The detailed susceptibility, specific heat, elastic and inelastic neutron scattering measurements, and spin-wave theory simulation on this system reveal that it has a 120 ordering ground state below TN=1.45K with in-plane nearest-neighbor exchange interaction ≈0.11meV. While the large separation 18.9 Å between magnetic layers makes the interlayer exchange interaction virtually zero, our results suggest that a weak easy-plane anisotropy is the driving force for the km=(1/3,1/3,0) magnetic ordering. The magnetic properties of Ba8MnNb6O24, along with its classical excitation spectra, contrast with the related triple perovskite Ba3MnNb2O9, which shows easy-axis anisotropy, and the isostructural compound Ba8CoNb6O24, in which the effective spin-12Co2+ spins do not order down to 60 mK and in which the spin dynamics shows signs of strong quantum effects.

AB - We successfully synthesized and characterized the triangular lattice antiferromagnet Ba8MnNb6O24, which comprises equilateral spin-52Mn2+ triangular layers separated by six nonmagnetic Nb5+ layers. The detailed susceptibility, specific heat, elastic and inelastic neutron scattering measurements, and spin-wave theory simulation on this system reveal that it has a 120 ordering ground state below TN=1.45K with in-plane nearest-neighbor exchange interaction ≈0.11meV. While the large separation 18.9 Å between magnetic layers makes the interlayer exchange interaction virtually zero, our results suggest that a weak easy-plane anisotropy is the driving force for the km=(1/3,1/3,0) magnetic ordering. The magnetic properties of Ba8MnNb6O24, along with its classical excitation spectra, contrast with the related triple perovskite Ba3MnNb2O9, which shows easy-axis anisotropy, and the isostructural compound Ba8CoNb6O24, in which the effective spin-12Co2+ spins do not order down to 60 mK and in which the spin dynamics shows signs of strong quantum effects.

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Ba8MnNb6 O24: A model two-dimensional spin- 52 triangular lattice antiferromagnet

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