Spin-Orbital Short-Range Order on a Honeycomb-Based Lattice

Frustrated magnetic materials, in which local conditions for energy minimization are incompatible because of the lattice structure, can remain disordered to the lowest temperatures. Such is the case for Ba₃CuSb₂O₉, which is magnetically anisotropic at the atomic scale but curiously isotropie on meso...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2012-05, Vol.336 (6081), p.559-563
Main Authors: Nakatsuji, S., Kuga, K., Kimura, K., Satake, R., Katayama, N., Nishibori, E., Sawa, H., Ishii, R., Hagiwara, M., Bridges, F., Ito, T. U., Higemoto, W., Karaki, Y., Halim, M., Nugroho, A. A., Rodriguez-Rivera, J. A., Green, M. A., Broholm, C.
Format: Article
Language:English
Subjects:
Anisotropy
Broken symmetry
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Crystal lattices
Degrees of freedom
Electron paramagnetic resonance
Electron paramagnetic resonance and relaxation
Exact sciences and technology
Excitation spectra
Fluctuation
Freezing
Geometry
Ground state
Honeycomb
Honeycomb construction
Honeycombs
Lattice energy
Lattice sites
Lattice theory
Lattices
Magnetic fields
Magnetic properties and materials
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Magnetically ordered materials: other intrinsic properties
Materials science
Mathematical analysis
Mathematical lattices
Nanostructure
Nanostructured materials
Octahedrons
Orbitals
Physics
Resists
Saturation moments and magnetic susceptibilities
Short range order
Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
Stands
Symmetry
X ray diffraction
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Summary:Frustrated magnetic materials, in which local conditions for energy minimization are incompatible because of the lattice structure, can remain disordered to the lowest temperatures. Such is the case for Ba₃CuSb₂O₉, which is magnetically anisotropic at the atomic scale but curiously isotropie on mesoscopic length and time scales. We find that the frustration of Wannier's Ising model on the triangular lattice is imprinted in a nanostructured honeycomb lattice of Cu⁺ ions that resists a coherent static Jahn-Teller distortion. The resulting two-dimensional random-bond spin-1/2 system on the honeycomb lattice has a broad spectrum of spin-dimer-like excitations and low-energy spin degrees of freedom that retain overall hexagonal symmetry.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1212154