Microscopic calculation of the spin-stiffness constant for the spin-(1/2 square-lattice Heisenberg antiferromagnet

Rajiv R.P. Singh, David A. Huse

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132 Scopus citations

Abstract

We discuss a systematic, microscopic calculation of the spin-stiffness constants for the spin-(1/2 square-lattice Heisenberg antiferromagnet. An infinitesimal twist is imposed upon the system by gradually rotating the direction of antiferromagnetic ordering. The difference in the ground-state energy of this system with respect to the uniformly ordered ground state can be related to the spin-stiffness constants. Series expansions and extrapolation for the energy of the twisted system lead to the estimate &s/J)=0.720.0. The ratio of the series for s and perpendicular susceptibility leads to an estimate for the spin-wave &(=cs/ 2 J)=1.180.02. The experiments on La2CuO4 are quantitatively consistent with a nearest-neighbor Heisenberg model when one takes into account these quantum renormalizations.

Original languageEnglish (US)
Pages (from-to)7247-7251
Number of pages5
JournalPhysical Review B
Volume40
Issue number10
DOIs
StatePublished - Jan 1 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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