Title: Quantum n-vector anharmonic crystal II: Displacement fluctuations
Authors: Angelescu, N
Verbeure, André
Zagrebnov, VA #
Issue Date: Sep-2000
Publisher: Kluwer academic/plenum publ
Series Title: Journal of statistical physics vol:100 issue:5-6 pages:829-851
Abstract: Based on the l/n-expansion derived in a previous paper, the displacement fluctuations are analyzed in a quantum n-vector model of anharmonic crystal in the large n regime. It is shown that in the ferroelectric phase the n --> infinity; limit of the local fluctuation field has faster large-distance correlation decay than its Hartree-Fock approximation. Also, the critical exponent of the global displacement fluctuation is strictly smaller there than the Hartree-Fock exponent. In particular, the displacement fluctuations may be normal in the ferroelectric phase in spite of the Hartree Fock prediction.
ISSN: 0022-4715
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Theoretical Physics Section
# (joint) last author

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