Néel temperature of quasi-low-dimensional Heisenberg antiferromagnets.
The Néel temperature T(N) of quasi-one- and quasi-two-dimensional antiferromagnetic Heisenberg models on a cubic lattice is calculated by Monte Carlo simulations as a function of interchain (interlayer) to intrachain (intralayer) coupling J(')/J down to J(')/J approximately = 10(-3). We find that T(N) obeys a modified random-phase approximationlike relation for small J(')/J with an effective universal renormalized coordination number, independent of the size of the spin. Empirical formulas describing T(N) for a wide range of J(') and useful for the analysis of experimental measurements are presented.
Yasuda
C
C
Department of Physics, Aoyama Gakuin University, Sagamihara 229-8558, Japan.
Todo
S
S
Hukushima
K
K
Alet
F
F
Keller
M
M
Troyer
M
M
Takayama
H
H