Spin dynamics of SrCu$_2$O$_3$ and the Heisenberg ladder

Details Spin dynamics of SrCu$_2$O$_3$ and the Heisenberg ladder Spin dynamics of SrCu$_2$O$_3$ and the Heisenberg ladder

1995-12-04

arxiv.org/abs/cond-mat/9512026v1

Physics

Condensed Matter

11 pages (Revtex) + 3 uuencoded ps files. To appear in Phys. Rev. B, Rapid Comm

Scientific paper

10.1103/PhysRevB.53.R2934

The $S=1/2$ Heisenberg antiferromagnet in the ladder geometry is studied as a model for the spin degrees of freedom of SrCu$_2$O$_3$. The susceptibility and the spin echo decay rate are calculated using a quantum Monte Carlo technique, and the spin-lattice relaxation rate is obtained by maximum entropy analytic continuation of imaginary time correlation functions. All calculated quantities are in reasonable agreement with experimental results for SrCu$_2$O$_3$ if the exchange coupling $J \approx 850$K, i.e. significantly smaller than in high-T$_c$ cuprates.

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