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Phys. Rev. B 53, R2934–R2937 (1996)

Spin dynamics of SrCu2O3 and the Heisenberg ladder

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Anders W. Sandvik and Elbio Dagotto
National High Magnetic Field Laboratory and Physics Department, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32306

Douglas J. Scalapino
Department of Physics, University of California, Santa Barbara, California 93106

Received 12 October 1995; revised 14 November 1995; published in the issue dated 1 February 1996

The S=1/2 Heisenberg antiferromagnet in the ladder geometry is studied as a model for the spin degrees of freedom of SrCu2O3. 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 SrCu2O3 if the exchange coupling J≈850 K. However, for the susceptibility fit an anomalously low factor is required.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.53.R2934
DOI:
10.1103/PhysRevB.53.R2934
PACS:
 
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