Field and surface effects on the ground state of antiferromagnetic systems
- 21 March 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 72 (12), 1925-1928
- https://doi.org/10.1103/physrevlett.72.1925
Abstract
The field dependence of the ground state of semi-infinite uniaxial antiferromagnets and films is investigated in terms of a two-dimensional area-preserving map, where the surfaces are introduced as appropriate boundary conditions. For the film, the ground state is calculated for any value of the number of planes in a very rapid and accurate way. For the semi-infinite system, we show that the so-called surface spin-flop state does not exist; by energetic arguments, we find that the instability of the antiferromagnetic configuration leads to an interchange of the sublattices. A nonhomogeneous ground state is instead found in the bulk spin-flop phase.Keywords
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