Open AccessAnalysis of the finite-temperature phase transition of Heisenberg antiferromagnetic compound LiVGe2O6
Author(s) -
Huei Li Huang,
Weifeng Li
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.217501
Subject(s) - condensed matter physics , antiferromagnetism , hamiltonian (control theory) , paramagnetism , physics , magnetic susceptibility , heisenberg model , phase transition , quantum phase transition , landau theory , excitation , quantum mechanics , mathematical optimization , mathematics
The susceptibility and nuclear magnetic resonance measurements on quasi-one-dimensional spin-1 Heisenberg antiferromagnet LiVGe2O6 indicate that this material shows a phase transition from paramagnetic state to antiferromagnetic Nel state at about 22 K, and there exists a gap in the low-temperature magnetic excitation spectrum. Based on the model Hamiltonian of LiVGe2O6, we propose a low-energy field theoryGinzburg-Landau theory for this compound. From this theory, we study the finite-temperature phase transition induced by spontaneous symmetry breaking and then calculate the finite-temperature susceptibility of LiVGe2O6. All the theoretical calculations are consistent with the experimental results.