O17NMR Study ofq=0Spin Excitations in a Nearly IdealS=121D Heisenberg Antiferromagnet,Sr2CuO3, up to 800 K Academic Article uri icon

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abstract

  • 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 = +/-pi / a staggered components. Our results support the logarithmic decrease of the uniform spin susceptibility below T approximately 0.015J, where J = 2200 K. From measurement of the dynamical spin susceptibility for q = 0 by the spin-lattice relaxation rate 1/T(1), 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

publication date

  • December 10, 2001