Abstract
We present a careful analysis of the temperature dependence of the nuclear spin-lattice relaxation rate l/T1 in gapped quasi-1D Heisenberg antiferromagnets. It is found that in order to estimate the value of the gap correctly from l/T1, the peculiar features of the dispersion curve for the triplet excitations must be taken into account. The temperature dependence of l/T1 due to two-magnon processes is reported for different values of the ratio r=J⌊/J‖ between the superexchange constants in a 2-leg ladder. As an illustrative example, we compare our results to the experimental findings for 63Cu l/T1 in the dimerized chains and 2-leg ladders contained in Sr14Cu24O41
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© 2002 Kluwer Academic Plenum Publishers
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Melzi, R., Carretta, P. (2002). On the Estimate of the Spin-Gap in Quasi-1D Heisenberg Antiferromagnets from Nuclear Spin-Lattice Relaxation. In: Bianconi, A., Saini, N.L. (eds) Stripes and Related Phenomena. Selected Topics in Superconductivity, vol 8. Springer, Boston, MA. https://doi.org/10.1007/0-306-47100-0_37
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DOI: https://doi.org/10.1007/0-306-47100-0_37
Publisher Name: Springer, Boston, MA
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