Monte Carlo study of a generalized icosahedral model on the simple cubic lattice
We study the critical behavior of a generalized icosahedral model on the simple cubic lattice. The field variable of the icosahedral model might take 1 of 12 vectors of unit length which are given by the normalized vertices of the icosahedron as value. Similar to the Blume-Capel model, where in addi...
Gespeichert in:
| 1. Verfasser: | |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
6 July 2020
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| In: |
Physical review
Year: 2020, Jahrgang: 102, Heft: 2 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.102.024406 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.102.024406
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| Verfasserangaben: | Martin Hasenbusch |
MARC
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| 520 | |a We study the critical behavior of a generalized icosahedral model on the simple cubic lattice. The field variable of the icosahedral model might take 1 of 12 vectors of unit length which are given by the normalized vertices of the icosahedron as value. Similar to the Blume-Capel model, where in addition to -1 and 1, as in the Ising model, the spin might take the value 0, we add in the generalized model (0,0,0) as allowed value. There is a parameter D that controls the density of these voids. For a certain range of D, the model undergoes a second-order phase transition. On the critical line, O(3) symmetry emerges. Furthermore, we demonstrate that within this range, similar to the Blume-Capel model on the simple cubic lattice, there is a value of D, where leading corrections to scaling vanish. We perform Monte Carlo simulations for lattices of a linear size up to L = 400 by using a hybrid of local Metropolis and cluster updates. The motivation to study this particular model is mainly of technical nature. Less memory and CPU time are needed than for a model with O(3) symmetry at the microscopic level. As the result of a finite-size scaling analysis we obtain nu = 0.711 64(10), eta = 0.037 84(5), and omega = 0.759( 2) for the critical exponents of the three-dimensional Heisenberg universality class. The estimate of the irrelevant renormalization group eigenvalue that is related with the breaking the O(3) symmetry is y(ico) = -2.19(2). | ||
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| 650 | 4 | |a renormalization-group | |
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