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- W2087258602 abstract "Finite-temperature local spin dynamics within the random spin-1/2 antiferromagnetic Heisenberg chain is studied numerically. The aim is to explain measured NMR spin-lattice relaxation times in BaCu_{2}(Si_{0.5}Ge_{0.5})_{2}O_{7}, which is the realization of a random spin chain. In agreement with experiments we find that the distribution of relaxation times within the model shows a very large span similar to the stretched-exponential form. The distribution is strongly reduced with increasing T but stays finite also in the high-T limit. Our results reveal the crucial role of the anisotropy (interaction), since the behavior is essentially contrast with the ones for XX model (equivalent to noninteracting fermions), where we do not find any significant T dependence of the distribution." @default.
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- W2087258602 date "2013-10-02" @default.
- W2087258602 modified "2023-10-16" @default.
- W2087258602 title "Local Spin Relaxation within the Random Heisenberg Chain" @default.
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- W2087258602 doi "https://doi.org/10.1103/physrevlett.111.147203" @default.
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