Exchange integral and the charge gap of the linear-chain cuprate Sr2CuO3
S.-L. Drechsler, J. Málek, S. Zališ, K. Rościszewski
DOI 10.1103/PhysRevB.53.11328 · Physical Review B
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Abstract
Fitting magnetic susceptibility data χ(T) from the linear chain cuprate Sr2CuO3 for T≤800 K, Ami et al. [Phys. Rev. B 51, 5994 (1995)] have extracted an unexpectedly large in-chain exchange integral Jch=215±25 meV. We reconsider qualitatively their fitting procedure [which is based on the rational polynomial Bonner-Fischer (BF) curve for the spin-1/2 antiferromagnetic Heisenberg chain (AFMHC)] by making use of an improved approximate AFMHC susceptibility expression. Our analytical χ(T) expression covers in addition to the well-known high-T limit also the intermediate- and low-T regions described so far numerically (Bethe ansatz) and analytically (renormalizational group theory) by Eggert, Affleck, and Takahashi [Phys. Rev. Lett. 73, 332 (1994)]. Due to the presence of a characteristic low-T logarithmic feature (hump) in the region of experimental interest, 0.1<kBT/Jch<0.2, the slope of the reduced susceptibility Jchχ(T) is considerably smaller than the BF predictions, thus questioning the authors’ statement that Jch is significantly larger than the corresponding CuO2-plane value of layered cuprates, Jpl=100 – 130 meV. In addition, we report exact (pd-model) CuO3-chain cluster calculations with the aim to clarify whether or not, and under what changes in standard plane parameter sets, the suggested enhanced Jch values and the large experimental charge gap Eg≊2 eV might be described in a microscopically realistic fashion. The corresponding results suggest that Jch’s ≳ 200 meV are rather unlikely. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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