Magnetic Susceptibility of Sr2CuO3 and SrCu2O3 |
| D.C. Johnston Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA |
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| The observed magnetic susceptibility χobs(T) data of Ami et al. for the linear-chain cuprate Sr2CuO3 are re-analyzed in terms of recent theory of Eggert et al. for the spin susceptibility χ(T) of the spin S=1/2 linear-chain Heisenberg antiferromagnet, which yielded the Cu-Cu exchange constant J/kB=2150 K. Values for J', the exchange constant in the rungs, and J, that in the legs, were estimated for the S=1/2 two-leg ladder compound SrCu2O3, using the χ(T) data of Azuma et al. The analyses suggest that J'/J ≈ 0.5, contrary to the expectation that J'/J ≈ 1, and that J/kB is very large ( ≈ 2000 K), similar to that in Sr2CuO3. |
| DOI: 10.12693/APhysPolA.91.181 PACS numbers: 74.25.Ha, 74.72.Jt, 75.40.Cx |