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      Spin-orbital short-range order on a honeycomb-based lattice.

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          Abstract

          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 Ba(3)CuSb(2)O(9), which is magnetically anisotropic at the atomic scale but curiously isotropic 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(2+) 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.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          1095-9203
          0036-8075
          May 04 2012
          : 336
          : 6081
          Affiliations
          [1 ] Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan. satoru@issp.u-tokyo.ac.jp
          Article
          336/6081/559
          10.1126/science.1212154
          22556246
          55d40162-9e3e-4663-b14a-6b1ec6ef7250
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