Staggered field-induced tricritical behavior in theS=12quasi-one-dimensional Ising antiferromagnet on a stacked triangular lattice: Monte Carlo simulations
| Autor: | Martin L. Plumer, E. Meloche |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Physical Review B. 76 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.76.174430 |
| Popis: | The impact of a staggered magnetic field due to quantum exchange mixing in the $S=\frac{1}{2}$ quasi-one-dimensional Ising antiferromagnet on a stacked triangular lattice is shown to induce a crossover from $XY$ to tricritical universality at the phase transition to the partially disordered state. Using a unique combination of histogram and cluster heat-bath techniques, extensive Monte Carlo simulations are performed to explore the effects of a small applied field that emulates a previously proposed addition to the spin Hamiltonian formulated to account for unusual spin soliton excitations in such systems. It is argued that quantum fluctuations governing short-range order in low-dimensional frustrated spin systems generally can affect measured critical properties at the onset to long-range magnetic order. Our results explain recent high resolution neutron scattering data on $\mathrm{Cs}\mathrm{Co}{\mathrm{Br}}_{3}$. |
| Databáze: | OpenAIRE |
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