Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 324, Issue 17, Pages 2687-2692Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2012.03.062
Keywords
Ising antiferromagnet; Triangular lattice; Frustration; Effective-field theory; Selective dilution; Phase transition
Funding
- Scientific Grant Agency of Ministry of Education of Slovak Republic [1/0234/12]
- EU (European Union) [ITMS26220120005]
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We employ an effective-field theory with correlations in order to study the phase diagram and ground-state magnetizations of a selectively diluted Ising antiferromagnet on triangular and honeycomb lattices. Dilution of different sublattices with generally unequal probabilities results in a rather intricate phase diagram in the sublattice dilution parameters space. In the case of the frustrated triangular lattice antiferromagnet the selective dilution affects the degree of frustration which can lead to some peculiar phenomena, such as reentrant behavior of long-range order or unsaturated sublattice magnetizations at zero temperature. The selectively diluted Ising antiferromagnet on the honeycomb lattice is obtained as a special case when one sublattice of the triangular lattice is completely removed by dilution. (C) 2012 Elsevier B.V. All rights reserved.
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