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Carretta P, Ciabattoni T, Cuccoli A, et al. Spin dynamics and magnetic correlation length in two-dimensional quantum heisenberg antiferromagnets. Phys Rev Lett. 2000;84(2):366-9doi: 10.1103/PhysRevLett.84.366.
Carretta, P., Ciabattoni, T., Cuccoli, A., Mognaschi, E., Rigamonti, A., Tognetti, V., & Verrucchi, P. (2000). Spin dynamics and magnetic correlation length in two-dimensional quantum heisenberg antiferromagnets. Physical review letters, 84(2), 366-9. https://doi.org/10.1103/PhysRevLett.84.366
Carretta, et al. "Spin dynamics and magnetic correlation length in two-dimensional quantum heisenberg antiferromagnets." Physical review letters vol. 84,2 (2000): 366-9. doi: https://doi.org/10.1103/PhysRevLett.84.366
Carretta P, Ciabattoni T, Cuccoli A, Mognaschi E, Rigamonti A, Tognetti V, Verrucchi P. Spin dynamics and magnetic correlation length in two-dimensional quantum heisenberg antiferromagnets. Phys Rev Lett. 2000 Jan 10;84(2):366-9. doi: 10.1103/PhysRevLett.84.366. PMID: 11015912.
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Phys Rev Lett. 2000 Jan 10;84(2):366-9. doi: 10.1103/PhysRevLett.84.366.

Spin dynamics and magnetic correlation length in two-dimensional quantum heisenberg antiferromagnets.

Physical review letters

Carretta, Ciabattoni, Cuccoli, Mognaschi, Rigamonti, Tognetti, Verrucchi

Affiliations

  1. Dipartimento di Fisica "A. Volta" and Unita INFM di Pavia, Via Bassi, 6 I-27100 Pavia, Italy.

PMID: 11015912 DOI: 10.1103/PhysRevLett.84.366

Abstract

The correlated spin dynamics and temperature dependence of the correlation length xi(T) in two-dimensional quantum (S = 1/2) Heisenberg antiferromagnets (2DQHAF) on a square lattice are discussed in light of experimental results of proton spin lattice relaxation in copper formiate tetradeuterate. In this compound the exchange constant is much smaller than the one in recently studied 2DQHAF, such as La2CuO4 and Sr2CuO2Cl2. Thus the spin dynamics can be probed in detail over a wider temperature range. The NMR relaxation rates turn out to be in excellent agreement with a theoretical mode-coupling calculation. The deduced temperature behavior of xi(T) is in agreement with high-temperature expansions, quantum Monte Carlo simulations, and the pure quantum self-consistent harmonic approximation. Contrary to the predictions of the theories based on the nonlinear sigma model, no evidence of crossover between different quantum regimes is observed.

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