PINWHEEL AND HERRINGBONE STRUCTURES OF PLANAR ROTORS WITH ANISOTROPIC INTERACTIONS ON A TRIANGULAR LATTICE WITH VACANCIES.
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PINWHEEL AND HERRINGBONE STRUCTURES OF PLANAR ROTORS WITH ANISOTROPIC INTERACTIONS ON A TRIANGULAR LATTICE WITH VACANCIES. / Harris, A. B.; Mouritsen, O. G.; Berlinsky, A. J.
In: Canadian Journal of Physics, Vol. 62, No. 9, 1984, p. 915-934.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - PINWHEEL AND HERRINGBONE STRUCTURES OF PLANAR ROTORS WITH ANISOTROPIC INTERACTIONS ON A TRIANGULAR LATTICE WITH VACANCIES.
AU - Harris, A. B.
AU - Mouritsen, O. G.
AU - Berlinsky, A. J.
PY - 1984
Y1 - 1984
N2 - A variety of theoretical techniques, including Monte Carlo (MC), mean field theory, and spin-wave theory, are used to analyze the phase diagram of a system of planar rotors on a triangular lattice with vancancies. A simple anisotropic interaction, which mimics the electric quadrupole-quadrupole interaction for diatomic molecules confined to rotate in the plane of the surface, induces a herringbone-ordered structure for the pure (x equals 1) system, whereas for x approximately equals 0. 75, if the vacancies are free to move, a 2 multiplied by 2 pinwheel structure is favored. For x equals 0. 75, MC calculations give a continuous transition with Ising exponents in agreement with renormalization group predictions for this universality class, the Heisenberg model with corner-type cubic anisotropy. Mean field theory gives the unexpected result that the pinwheel phase is stable only along the herringbone-disordered state coexistence line in the temperature versus chemical potential phase diagram. Spin-wave theory is used to show that there is, in fact, a finite domain of stability for the pinwheel phase, and a complete phase diagram, which encompasses all available information, is conjectured.
AB - A variety of theoretical techniques, including Monte Carlo (MC), mean field theory, and spin-wave theory, are used to analyze the phase diagram of a system of planar rotors on a triangular lattice with vancancies. A simple anisotropic interaction, which mimics the electric quadrupole-quadrupole interaction for diatomic molecules confined to rotate in the plane of the surface, induces a herringbone-ordered structure for the pure (x equals 1) system, whereas for x approximately equals 0. 75, if the vacancies are free to move, a 2 multiplied by 2 pinwheel structure is favored. For x equals 0. 75, MC calculations give a continuous transition with Ising exponents in agreement with renormalization group predictions for this universality class, the Heisenberg model with corner-type cubic anisotropy. Mean field theory gives the unexpected result that the pinwheel phase is stable only along the herringbone-disordered state coexistence line in the temperature versus chemical potential phase diagram. Spin-wave theory is used to show that there is, in fact, a finite domain of stability for the pinwheel phase, and a complete phase diagram, which encompasses all available information, is conjectured.
U2 - 10.1139/p84-126
DO - 10.1139/p84-126
M3 - Journal article
AN - SCOPUS:0021499731
VL - 62
SP - 915
EP - 934
JO - Canadian Journal of Physics
JF - Canadian Journal of Physics
SN - 0008-4204
IS - 9
ER -
ID: 238392249