Low temperature properties of the triangular-lattice antiferromagnet: a bosonic spinon theory

We study the low temperature properties of the triangular-lattice Heisenberg antiferromagnet with a mean field Schwinger spin-1/2 boson scheme that reproduces quantitatively the zero temperature energy spectrum derived previously using series expansions. By analyzing the spin-spin and the boson dens...

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Bibliographic Details
Published inarXiv.org
Main Authors Mezio, A, Manuel, L O, Singh, R R P, Trumper, A E
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 20.12.2012
Subjects
Antiferromagnetism
Bosons
Density
Energy spectra
Entropy
Excitation
Free energy
High temperature
Physics - Strongly Correlated Electrons
Temperature
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Summary:We study the low temperature properties of the triangular-lattice Heisenberg antiferromagnet with a mean field Schwinger spin-1/2 boson scheme that reproduces quantitatively the zero temperature energy spectrum derived previously using series expansions. By analyzing the spin-spin and the boson density-density dynamical structure factors, we identify the unphysical spin excitations that come from the relaxation of the local constraint on bosons. This allows us to reconstruct a free energy based on the physical excitations only, whose predictions for entropy and uniform susceptibility seem to be reliable within the temperature range $0< T <0.3J, which is difficult to access by other methods. The high values of entropy, also found in high temperature expansions studies, can be attributed to the roton-like narrowed dispersion at finite temperatures.
ISSN:2331-8422
DOI:10.48550/arxiv.1203.3794