Phys. Rev. Lett. 76, 4612–4615 (1996)Dynamics in the S = 1/2 One-Dimensional Antiferromagnet Sr2CuO3 via 63Cu NMRReceived 22 January 1996; published in the issue dated 10 June 1996 The 63Cu nuclear spin-lattice relaxation rate ( 1/T1) and the Gaussian spin-echo decay rate ( 1/T2G) have been measured in the spin 1/2 one-dimensional antiferromagnet Sr2CuO3 ( J = 2200 K) in the temperature range from 20 to 280 K. We observed the following temperature dependencies: 1/T1 = const and 1/T2G∝1/√T, consistent with scaling theory. The value of T1√T/T2G is also in good agreement with theoretical prediction. These results provide strong experimental support for the quantum critical behavior of the S = 1/2 1D Heisenberg model at finite temperatures. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.4612
DOI:
10.1103/PhysRevLett.76.4612
PACS:
75.40.Gb, 76.60.Es
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