## 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 language | English (US) |
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Pages (from-to) | 7247-7251 |

Number of pages | 5 |

Journal | Physical Review B |

Volume | 40 |

Issue number | 10 |

DOIs | |

State | Published - 1989 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Condensed Matter Physics