科研之友
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摘要
We study three-dimensional dimerized S = 1/2 Heisenberg antiferromagnets, using quantum Monte Carlo simulations of systems with three different dimerization patterns. We propose a way to relate the Neel temperature T-N to the staggered moment m(s) of the ground state. Mean-field arguments suggest T-N proportional to m(s) close to a quantum-critical point. We find an almost perfect universality (including the prefactor) if T-N is normalized by a proper lattice-scale energy. We show that the temperature T* at which the magnetic susceptibility has a maximum is a good choice, i.e., T-N/T* versus m(s) is a universal also beyond the linear regime). These results are useful for analyzing experiments on systems where the spin couplings are not known precisely, e. g., TlCuCl3.
- 出版日期2012-1-27
