Surface critical exponents at a uniaxial Lifshitz point

Details Surface critical exponents at a uniaxial Lifshitz point Surface critical exponents at a uniaxial Lifshitz point

2001-11-13

arxiv.org/abs/cond-mat/0111233v1

Phys. Rev. B 65, 184406 (2002)

Physics

Condensed Matter

10 pages, 7 figures included

Scientific paper

10.1103/PhysRevB.65.184406

Using Monte Carlo techniques, the surface critical behaviour of three-dimensional semi-infinite ANNNI models with different surface orientations with respect to the axis of competing interactions is investigated. Special attention is thereby paid to the surface criticality at the bulk uniaxial Lifshitz point encountered in this model. The presented Monte Carlo results show that the mean-field description of semi-infinite ANNNI models is qualitatively correct. Lifshitz point surface critical exponents at the ordinary transition are found to depend on the surface orientation. At the special transition point, however, no clear dependency of the critical exponents on the surface orientation is revealed. The values of the surface critical exponents presented in this study are the first estimates available beyond mean-field theory.

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