Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin dynamics simulations of excitations and critical dynamics in
  RbMnF_3   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=(1.43\pm 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.

25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org