Abstract
The proton NMR spin-lattice relaxation time T/sub 1/ has been measured in the spin-1/2 one-dimensional antiferromagnet (1DAF) ..cap alpha..-bis (N-methylsalicylamidinato) -copper (II) (CuNSal) at low temperatures and high fields. T/sub 1/ is dominated by electron spin fluctuations of the 1DAF, and we show that these fluctuations are described by Fermi-Dirac statistics for the one-magnon contribution to T/sub 1/ but that the two-magnon part is given by Bose-Einstein statistics.
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