TY - JOUR

T1 - 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

AU - Kaul, Ribhu K.

AU - Melko, Roger G.

PY - 2008/7/15

Y1 - 2008/7/15

N2 - 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).

AB - 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).

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U2 - 10.1103/PhysRevB.78.014417

DO - 10.1103/PhysRevB.78.014417

M3 - Article

AN - SCOPUS:47949089097

SN - 1098-0121

VL - 78

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 1

M1 - 014417

ER -