Phys. Rev. Lett. 87, 247202 (2001) [4 pages]

¹⁷O NMR Study of q = 0 Spin Excitations in a Nearly Ideal S = 1/2 1D Heisenberg Antiferromagnet, Sr₂CuO₃, up to 800 K

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K. R. Thurber^1,2,*, A. W. Hunt^1,2, T. Imai^1,2, and F. C. Chou²
¹Department of Physics, MIT, Cambridge, Massachusetts 02139
²Center for Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139

Received 17 August 2001; published 26 November 2001

We used ¹⁷O NMR to probe the uniform (wave vector q = 0) electron spin excitations up to 800 K in Sr₂CuO₃ and separate the q = 0 from the q = ±π/a staggered components. Our results support the logarithmic decrease of the uniform spin susceptibility below T∼0.015J, where J = 2200K. From measurement of the dynamical spin susceptibility for q = 0 by the spin-lattice relaxation rate 1/T₁, we demonstrate that the q = 0 mode of spin transport is ballistic at the T = 0 limit, but has a diffusion-like contribution at finite temperatures even for T≪J.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.87.247202

DOI:

10.1103/PhysRevLett.87.247202

PACS:

75.40.Gb, 76.60.Es

^*Present address: U.S. Army Research Lab., Adelphi, MD.

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Phys. Rev. Lett. 87, 247202 (2001) [4 pages]

17O NMR Study of q = 0 Spin Excitations in a Nearly Ideal S = 1/2 1D Heisenberg Antiferromagnet, Sr2CuO3, up to 800 K

¹⁷O NMR Study of q = 0 Spin Excitations in a Nearly Ideal S = 1/2 1D Heisenberg Antiferromagnet, Sr₂CuO₃, up to 800 K