Interface in Potts ferromagnet: phase diagram and critical exponents

摘要: Within a real-space renormalisation group framework, the authors treat q-state Potts ferromagnet in simple cubic lattice consisting of two different semi-infinite bulks (respectively characterised by coupling constants J1 and J2) separated (1,0,0) interface (characterised Js). The use rather sophisticated two-terminal cluster allows quite reliable discussion phase diagram its universality classes. Four physically phases are obtained, namely paramagnetic double-bulk, single-bulk surface ferromagnetic ones. critical contains multicritical line (associated with not=J2) which turn special point associated J1=J2.