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ISSN 2071-0186   Ukr. J. Phys. 2015, Vol. 60, N 4, p.334-338
doi:10.15407/ujpe60.04.0334    Paper

Sarkanych P.1, Holovatch Yu.2, Kenna R.3

1 Department for Theoretical Physics, Ivan Franko National University of Lviv
(12 Drahomanov St., 79005 Lviv, Ukraine)
2 Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine
(79011 Lviv, Ukraine; e-mail: petrosark@gmail.com)
3 Applied Mathematics Research Centre, Coventry University
(Coventry CV1 5FB, UK)

On the Phase Diagram of the 2d Ising Model with Frustrating Dipole Interaction

Section: Solid matter
Language: English

Abstract: Due to intrinsic frustrations of interaction, the 2d Ising model with competing ferromagnetic short-range nearest-neighbour and antiferromagnetic long-range dipole interactions possesses a rich phase diagram. The order of the phase transition from the striped h = 1 phase to the tetragonal phase that is observed in this model has been a subject of recent controversy. We address this question by using the partition function density analysis in the complex temperature plane. Our results support the second-order phase transition scenario. To measure the strength of the phase transition, we calculate the values of specific heat critical exponent α. Along with the space dimension, it appears to depend on the ratio of strengths of the short-range and long-range interactions.

Key words: frustrations, phase transition, density of partition function zeros, critical exponents.