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- W1759331516 abstract "Spin-dynamics simulations have been used to investigate the dynamic behavior of RbMnF_3, treating it as a classical Heisenberg antiferromagnet on a simple cubic lattice. Time-evolutions of spin configurations were determined numerically from coupled equations of motion for individual spins using a new algorithm which is based on Suzuki-Trotter decompositions of exponential operators. The dynamic structure factor was calculated from the space- and time-displaced spin-spin correlation function. The crossover from hydrodynamic to critical behavior of the dispersion curve and spin-wave half-width was studied as the temperature was increased towards the critical value. The dynamic critical exponent was estimated to be z=(1.43pm 0.03), which is slightly lower than the dynamic scaling prediction, but in good agreement with a recent experimental value. Comparisons are made of both the dispersion curve and the lineshapes obtained from our simulations with very recent experimental results for RbMnF_3 are presented." @default.
- W1759331516 created "2016-06-24" @default.
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- W1759331516 date "1999-12-20" @default.
- W1759331516 modified "2023-09-27" @default.
- W1759331516 title "Spin dynamics simulations of excitations and critical dynamics in RbMnF_3" @default.
- W1759331516 hasPublicationYear "1999" @default.
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