Quantum Monte Carlo Simulation of the Trellis Lattice Heisenberg Model for SrCu2O3 and CaV2O5.

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  • Miyahara Shin
    Institute for Solid State Physics, University of Tokyo, Roppongi 7–22–1, Minatoku, Tokyo 106–8666
  • Troyer Matthias
    Institute for Solid State Physics, University of Tokyo, Roppongi 7–22–1, Minatoku, Tokyo 106–8666
  • Johnston David C.
    Ames Laboratory–USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, U.S.A.
  • Ueda Kazuo
    Institute for Solid State Physics, University of Tokyo, Roppongi 7–22–1, Minatoku, Tokyo 106–8666

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  • Quantum Monte Carlo Simulation of the T
  • Quantum Monte Carlo Simulation of the Trellis Lattice Heisenberg Model for SrCu<sub><b> 2</b></sub>O<sub><b> 3</b></sub> and CaV<sub><b> 2</b></sub>O<sub><b> 5</b></sub>

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We study the spin-1/2 trellis lattice Heisenberg model, a coupled spin ladder system, both by perturbation around the dimer limit and by quantum Monte Carlo simulations. We discuss the influence of the inter-ladder coupling on the spin gap and the dispersion, and present results for the temperature dependence of the uniform susceptibility. The latter was found to be parameterized well by a mean-field type scaling ansatz. Finally we discuss fits of experimental measurements on SrCu_2O_3 and CaV_2O_5 to our results.

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