THE ROLE OF A DISORDERED INTERFACE BETWEEN 2 FERROMAGNETIC ISING SYSTEMS IN A TRANSVERSE FIELD

The phase diagrams of a disordered interface consisting of two mixed l ayers between two semi-infinite spin-1/2 Ising ferromagnets (A and B) in a transverse field are investigated by the use of the effective-fie ld theory. We have obtained some interesting results. (i) For zero tra nsverse field, the increase of thickness in the interface with alloyin g disorder A(p) - B1-p does not change the possibility of interface ma gnetism. (ii) In a finite transverse field, the critical exchange inte raction at which the interface magnetism can appear may be affected se verely, especially for the systems with pure (p = 0 and p = 1) interfa ces, although the critical value of the disordered interface with 0.3 less-than-or-equal-to p less-than-or-equal-to 0.9 does not deviate so much from that of zero transverse field. (iii) The possibility of obse rving the interface magnetism experimentally is also proposed, applyin g a large transverse field.