Heisenberg antiferromagnet on the square lattice for S>~1

Alessandro Cuccoli, Valerio Tognetti, Paola Verrucchi, and Ruggero Vaia
Phys. Rev. B 58, 14151 – Published 1 December 1998
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Abstract

Theoretical predictions of a semiclassical method—the pure-quantum self-consistent harmonic approximation—for the correlation length and staggered susceptibility of the two-dimensional quantum Heisenberg antiferromagnet (2DQHAF) on the square lattice agree very well with recent quantum Monte Carlo data for S=1, as well as with experimental data for the S=5/2 compounds Rb2MnF4 and KFeF4. The theory is parameter free and can be used to estimate the exchange coupling: for KFeF4 we find J=2.33±0.33 meV, consistent with previously determined values. On this basis, the adequacy of the quantum nonlinear σ model approach in describing the 2DQHAF when S>~1 is discussed.

  • Received 8 April 1998

DOI:https://doi.org/10.1103/PhysRevB.58.14151

©1998 American Physical Society

Authors & Affiliations

Alessandro Cuccoli, Valerio Tognetti, and Paola Verrucchi

  • Dipartimento di Fisica dell’Università di Firenze and Istituto Nazionale di Fisica della Materia (INFM), Largo E. Fermi 2, I-50125 Firenze, Italy

Ruggero Vaia

  • Istituto di Elettronica Quantistica del Consiglio Nazionale delle Ricerche, via Panciatichi 56/30, I-50127 Firenze, Italy
  • Istituto Nazionale di Fisica della Materia (INFM), Largo E. Fermi 2, I-50125 Firenze, Italy

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Issue

Vol. 58, Iss. 21 — 1 December 1998

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