Susceptibility and excitation spectrum of (VO)2P2O7 in ladder and dimer-chain models

T. Barnes and J. Riera
Phys. Rev. B 50, 6817 – Published 1 September 1994
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Abstract

We present numerical results for the magnetic susceptibility of a Heisenberg antiferromagnetic spin ladder as a function of temperature and the spin-spin interaction strengths J and J. These are contrasted with bulk-limit results for the dimer chain. A fit to the experimental susceptibility of the candidate spin-ladder compound vanadyl pyrophosphate, (VO)2P2O7, gives the parameters J=7.82 meV and J=7.76 meV. With these values we predict a singlet-triplet energy gap of Egap=3.9 meV, and give a numerical estimate of the ladder triplet dispersion relation ω(k). In contrast, a fit to the dimer-chain model leads to J1=11.11 meV and J2=8.02 meV, which predicts a gap of Egap=4.9 meV.

  • Received 15 April 1994

DOI:https://doi.org/10.1103/PhysRevB.50.6817

©1994 American Physical Society

Authors & Affiliations

T. Barnes

  • Physics Division and Center for Computationally Intensive Physics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
  • Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996

J. Riera

  • Physics Division and Center for Computationally Intensive Physics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
  • Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235

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Vol. 50, Iss. 10 — 1 September 1994

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