Large- N estimates of universal amplitudes of the C PN-1 theory and comparison with a S= 1 2 square-lattice model with competing four-spin interactions

Ribhu K. Kaul, Roger G. Melko

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29 Scopus citations

Abstract

We present computations of certain finite-size scaling functions and universal amplitude ratios in the large- N limit of the C PN-1 field theory. We pay particular attention to the uniform susceptibility, the spin stiffness, and the specific heat. Field theoretic arguments have shown that the long-wavelength description of the phase transition between the Néel and valence-bond solid states in square lattice S=1/2 antiferromagnets is expected to be the noncompact C P1 field theory. We provide a detailed comparison between our field theoretic calculations and quantum Monte Carlo data close to the Néel-VBS transition on a S=1/2 square-lattice model with competing four-spin interactions (the JQ model).

Original languageEnglish
Article number014417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number1
DOIs
StatePublished - Jul 15 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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