Reanalysis of "Dilute random-field Ising models and uniform-field antiferromagnets"
نویسندگان
چکیده
The susceptibility series presented by Aharony, Harris, and Meir [Phys. Rev. B 32 3203 (1985)] for the random-field Ising model and dilute antiferromagnet in a field are reanalyzed. This reanalysis utilizes improved methods of power-series analysis, more recent pc estimates, and a redefined constant term. We also invoke updated exponent estimates for comparison with our results, and find that new estimates of γ for the two models are consistent with each other and with the scaling value from the literature estimates.
منابع مشابه
Dilute random-field Ising models and uniform-field antiferromagnets.
The order-parameter susceptibility χ of dilute Ising models with random fields and dilute antiferromagnets in a uniform field are studied for low temperatures and fields with use of low-concentration expansions, scaling theories, and exact solutions on the Cayley tree to elucidate the behavior near the percolation threshold at concentration pc. On the Cayley tree, as well as for d>6, both model...
متن کاملMetamagnets in uniform and random fields
We study a two-sublattice Ising metamagnet with nearest and next-nearestneighbor interactions, in both uniform and random fields. Using a mean-field approximation, we show that the qualitative features of the phase diagrams are significantly dependent on the distribution of the random fields. In particular, for a Gaussian distribution of random fields, the behavior of the model is qualitatively...
متن کاملJ un 1 99 7 EXPERIMENTS ON THE RANDOM FIELD ISING MODEL
New advances in experiments on the random-field Ising model, as realized in dilute antiferromagnets, have brought us much closer to a full characterization of the static and dynamic critical behavior of the unusual phase transition in three dimensions (d = 3). The most important experiments that have laid the ground work for our present understanding are reviewed. Comparisons of the data with M...
متن کاملSingle Average Magnetization, Staggered Symmetry, and next Nearest Neighbors in Dilute Systems
The usual mean field treatment of dilute antiferromagnets in a uniform field considers two sublattice magnetizations and yields a continuous transition. On the opposite, starting with one single average magnetization produces a tricritical point. This apparent discrepancy is explained by showing that a single magnetization approach does indeed account for the staggered symmetry but also simulta...
متن کاملMagnetic Properties and Phase Transitions in a Spin-1 Random Transverse Ising Model on Simple Cubic Lattice
Within the effective-field theory with correlations (EFT), a transverse random field spin-1 Ising model on the simple cubic (z=6) lattice is studied. The phase diagrams, the behavior of critical points, transverse magnetization, internal energy, magnetic specific heat are obtained numerically and discussed for different values of p the concentration of the random transverse field.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review. B, Condensed matter
دوره 34 5 شماره
صفحات -
تاریخ انتشار 1986