Collective impurity effects in the Heisenberg triangular antiferromagnet

We theoretically investigate the Heisenberg antiferromagnet on a triangular lattice doped with nonmagnetic impurities. Two nontrivial effects resulting from collective impurity behavior are predicted. The first one is related to presence of uncompensated magnetic moments localized near vacancies as...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-03, Vol.592 (1), p.12112
Main Authors: Maryasin, V S, Zhitomirsky, M E
Format: Article
Language:English
Subjects:
Antiferromagnetism
Clustering
Condensed Matter
Curie temperature
Impurities
Impurity effects
Lattice vacancies
Low temperature
Magnetic moments
Magnetic permeability
Magnetism
Physics
Statistical Mechanics
Strongly Correlated Electrons
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Summary:We theoretically investigate the Heisenberg antiferromagnet on a triangular lattice doped with nonmagnetic impurities. Two nontrivial effects resulting from collective impurity behavior are predicted. The first one is related to presence of uncompensated magnetic moments localized near vacancies as revealed by the low-temperature Curie tail in the magnetic susceptibility. These moments exhibit an anomalous growth with the impurity concentration, which we attribute to the clustering mechanism. In an external magnetic field, impurities lead to an even more peculiar phenomenon lifting the classical ground-state degeneracy in favor of the conical state. We analytically demonstrate that vacancies spontaneously generate a positive biquadratic exchange, which is responsible for the above degeneracy lifting.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/592/1/012112