Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2006-09-27
J. Phys.: Condens. Matter 19 (2007) 145206
Physics
Condensed Matter
Statistical Mechanics
Proceedings of the Highly Frustrated Magnetism (HFM2006) conference. To appear in a special issue of J. Phys. Condens. Matter
Scientific paper
10.1088/0953-8984/19/14/145206
We investigate freezing characteristics of a finite dipolar hexagonal plate by the Monte Carlo simulation. The hexagonal plate is cut out from a piled triangular lattice of three layers with FCC-like (ABCABC) stacking structure. In the present study an annealing simulation is performed for the dipolar plate uniaxially compressed in the direction of layer-piling. We find spin melting and refreezing driven by the uniaxial compression. Each of the melting and refreezing corresponds one-to-one with a change of the ground states induced by compression. The freezing temperatures of the ground-state orders differ significantly from each other, which gives rise to the spin melting and refreezing of the present interest. We argue that these phenomena are originated by a finite size effect combined with peculiar anisotropic nature of the dipole-dipole interaction.
Kuroda Akiyoshi
Matsushita Katsuyoshi
Sugano Ryoko
Takayama Hajime
Tomita Yusuke
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