Critical spin dynamics of the 2D quantum Heisenberg antiferromagnets: Sr_2CuO_2Cl_2 and Sr_2Cu_3O_4Cl_2

Y. J. Kim; R. J. Birgeneau; F. C. Chou; R. W. Erwin; M. A. Kastner

doi:10.1103/PhysRevLett.86.3144

paper

Critical spin dynamics of the 2D quantum Heisenberg antiferromagnets: Sr_2CuO_2Cl_2 and Sr_2Cu_3O_4Cl_2

arXiv:cond-mat/0012239 · doi:10.1103/PhysRevLett.86.3144

Abstract

We report a neutron scattering study of the long-wavelength dynamic spin correlations in the model two-dimensional $S = 1/2$ square lattice Heisenberg antiferromagnets Sr $_{2}$ CuO $_{2}$ Cl $_{2}$ and Sr $_{2}$ Cu $_{3}$ O $_{4}$ Cl $_{2}$ . The characteristic energy scale, $ω_{0} (T / J)$ , is determined by measuring the quasielastic peak width in the paramagnetic phase over a wide range of temperature ($0.2 \alt T/J \alt 0.7$). The obtained values for $ω_{0} (T / J)$ agree {\it quantitatively} between the two compounds and also with values deduced from quantum Monte Carlo simulations. The combined data show scaling behavior, $ω \sim ξ^{- z}$ , over the entire temperature range with $z = 1.0 (1)$ , in agreement with dynamic scaling theory.

4 pages, 3 figures, to be published in Phys. Rev. Lett

Critical spin dynamics of the 2D quantum Heisenberg antiferromagnets: Sr_2CuO_2Cl_2 and Sr_2Cu_3O_4Cl_2

Abstract

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