title: Néel temperature of quasi-low-dimensional Heisenberg antiferromagnets.
abstract: 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.
authors.affiliation: Department of Physics, Aoyama Gakuin University, Sagamihara 229-8558, Japan.
authors.forename: C
authors.initials: C
authors.lastname: Yasuda
authors.forename: S
authors.initials: S
authors.lastname: Todo
authors.forename: K
authors.initials: K
authors.lastname: Hukushima
authors.forename: F
authors.initials: F
authors.lastname: Alet
authors.forename: M
authors.initials: M
authors.lastname: Keller
authors.forename: M
authors.initials: M
authors.lastname: Troyer
authors.forename: H
authors.initials: H
authors.lastname: Takayama