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28 March 2024
 
  » arxiv » 1203.1983

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Two-dimensional Heisenberg behavior of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4
S. Fujiyama ; H. Ohsumi ; T. Komesu ; J. Matsuno ; B.J. Kim ; M. Takata ; T. Arima ; H. Takagi ;
Date 9 Mar 2012
AbstractDynamical correlations of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insu- lator Sr2IrO4 was revealed by resonant magnetic x-ray diffuse scattering. We found two-dimensional antiferromagnetic fluctuation with a large in-plane correlation length exceeding 100 lattice spacings at even 20 K above the mangnetic ordering temperature. In marked contrast to the naive expecta- tion of strong magnetic anisotropy associated with an enhanced spin-orbit coupling, we discovered isotropic isospin correlation that is well described by the two-dimensional S = 1/2 quantum Heisen- berg model. The estimated antiferromagnetic coupling constant as large as J ~ 0.1 eV that is comparable to the small Mott gap (< 0.5 eV) points the weak and marginal Mott character of this spin-orbital entangled system.
Source arXiv, 1203.1983
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