Hexagonal-close-packed lattice: Ground state and phase transition

Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Apr;85(4 Pt 1):041107. doi: 10.1103/PhysRevE.85.041107. Epub 2012 Apr 9.

Abstract

We study the ground state (GS) and the phase transition in a hexagonal-close-packed lattice with both XY and Ising models by using extensive Monte Carlo simulation. We suppose the in-plane interaction J1 and interplane interaction J2, both antiferromagnetic. The system is frustrated with two kinds of GS configuration below and above a critical value of η=J1/J2 (ηc). For the Ising case, one has ηc=0.5 which separates in-plane ferromagnetic and antiferromagnetic states, while for the XY case ηc=1/3 separates the collinear and noncollinear spin configurations. The phase transition is shown to be of first (second) order for η>(<)ηc. The phase diagram in the space (η,T) is shown for both cases.

MeSH terms

  • Colloids / chemistry*
  • Colloids / radiation effects*
  • Computer Simulation
  • Magnetic Fields
  • Models, Chemical*
  • Models, Molecular*
  • Phase Transition

Substances

  • Colloids