On the estimate of the spin-gap in quasi-1D Heisenberg antiferromagnets from nuclear spin-lattice relaxation

Details On the estimate of the spin-gap in quasi-1D Heisenberg antiferromagnets from nuclear spin-lattice relaxation On the estimate of the spin-gap in quasi-1D Heisenberg antiferromagnets from nuclear spin-lattice relaxation

1999-04-06

arxiv.org/abs/cond-mat/9904074v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, Proc. of the Stripes 98 Conference (Roma, June 1998)

Scientific paper

We present a careful analysis of the temperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ in gapped quasi-1D Heisenberg antiferromagnets. It is found that in order to estimate the value of the gap correctly from $1/T_1$ the peculiar features of the dispersion curve for the triplet excitations must be taken into account. The temperature dependence of $1/T_1$ due to two-magnon processes, is reported for different values of the ratio $r=J_{\perp}/J_{\parallel}$ between the superexchange constants in a 2-leg-ladder. As an illustrative example we compare our results to the experimental findings for $^{63}Cu 1/T_1$ in the dimerized chains and 2-leg-ladders contained in Sr$_{14}Cu_{24}O_{41}$

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