Accurate determination of the exchange constant inSr2CuO3from recent theoretical results

Abstract

Data from susceptibility measurements [Ami et al., Phys. Rev. B 51, 5994 (1995)] on ${\mathrm{Sr}}_2$ ${\mathrm{CuO}}_3$ are compared with recent theoretical predictions [Eggert et al., Phys. Rev. Lett. 73, 332 (1994)] for the magnetic susceptibility of the antiferromagnetic spin-1/2 Heisenberg chain. The experimental data fully confirms the theoretical predictions and in turn we establish that ${\mathrm{Sr}}_2$ ${\mathrm{CuO}}_3$ behaves almost perfectly like a one-dimensional antiferromagnet with an exchange coupling of J=${1700}_{\mathrm{-}100}^{+150\mathrm{}}$ K. © 1996 The American Physical Society.