Zobrazeno 1 - 10
of 149
pro vyhledávání: '"Salinas, S. R."'
Autor:
de Castilho, William, Salinas, S. R.
Publikováno v:
J. Stat. Mech. (2022) 073106
We analyze the thermodynamic behavior of a ferromagnetic mean-spherical model with three distinct spin components and the addition of Dzyaloshinkii-Moriya interactions. Exact calculations are performed for classical and quantum versions of this latti
Externí odkaz:
http://arxiv.org/abs/2203.09970
Autor:
de Castilho, William, Salinas, S. R.
Publikováno v:
Brazilian Journal of Physics, 51(4), 1175-1181, 2021
We analyze the phase diagram of an elementary statistical lattice model of classical, discrete, spin variables, with nearest-neighbor ferro-magnetic isotropic interactions in competition with chiral interactions along an axis. At the mean-field level
Externí odkaz:
http://arxiv.org/abs/2108.08833
Publikováno v:
Physica A 531, 121592 (2019)
We consider a Lebwohl-Lasher lattice model with nematic directors restricted to point along $p$ planar directions. This $XY$ Lebwohl-Lasher system is the nematic analogue of the standard $p$-state clock model. We then include chiral interactions, and
Externí odkaz:
http://arxiv.org/abs/1903.01822
We investigate the connections between some simple Maier-Saupe lattice models, with a discrete choice of orientations of the microscopic directors, and a recent proposal of a two-tensor formalism to describe the phase diagrams of nematic liquid-cryst
Externí odkaz:
http://arxiv.org/abs/1608.08269
Autor:
Henriques, Vera B., Salinas, S. R.
In a pioneer work, John Nagle has shown that an Ising chain with competing short and long-range interactions displays second and first-order phase transitions separated by a tricritical point. More recently, it has been claimed that Nagle's model pro
Externí odkaz:
http://arxiv.org/abs/1508.03543
Publikováno v:
Phys. Rev. E 92, 062503 (2015)
We introduce shape fluctuations in a liquid-crystalline system by considering an elementary Maier--Saupe lattice model for a mixture of uniaxial and biaxial molecules. Shape variables are treated in the annealed (thermalized) limit. We analyze the th
Externí odkaz:
http://arxiv.org/abs/1507.03861
We investigate the phase diagram of a spin--1 Ising spin-glass model on a Cayley tree. According to early work of Thompson and collaborators, this problem can be formulated in terms of a set of nonlinear discrete recursion relations along the branche
Externí odkaz:
http://arxiv.org/abs/1401.3989
We investigate the phase diagram of a spin-$1/2$ Ising model on a cubic lattice, with competing interactions between nearest and next-nearest neighbors along an axial direction, and fully connected spins on the sites of each perpendicular layer. The
Externí odkaz:
http://arxiv.org/abs/1310.5691
Enhancement of nematic order and global phase diagram of a lattice model for coupled nematic systems
Autor:
Liarte, D. B., Salinas, S. R.
Publikováno v:
Braz. J. Phys. 42 (2012) 261
We use an infinite-range Maier-Saupe model, with two sets of local quadrupolar variables and restricted orientations, to investigate the global phase diagram of a coupled system of two nematic subsystems. The free energy and the equations of state ar
Externí odkaz:
http://arxiv.org/abs/1205.4373
Autor:
Bienzobaz, P. F., Salinas, S. R.
Publikováno v:
Physica A, 391, 6399, 2012
We analyze the phase diagram of a quantum mean spherical model in terms of the temperature $T$, a quantum parameter $g$, and the ratio $p=-J_{2}/J_{1}$, where $J_{1}>0$ refers to ferromagnetic interactions between first-neighbor sites along the $d$ d
Externí odkaz:
http://arxiv.org/abs/1203.4073