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- W2029185846 abstract "In the framework of the exactly solvable model, using nonperturbative methods, the temperature and magnetic field behavior of the NMR relaxation rate (and low-energy dynamical structure factor) for the antiferromagnetic Heisenberg spin-1/2 chain with magnetic impurities is calculated. For a single magnetic impurity, totally screened at low temperatures by spinons of the chain, the critical exponents, which determine the low-temperature and magnetic field behavior, get renormalized. For the finite concentration of impurities with the random distribution of the impurity-chain coupling the weak disorder in the distribution does not produce essential changes to the dynamical structure factor. Contrary, the strong disorder yields drastically different behavior of the low-energy dynamical characteristics, comparing to the homogeneous chain. Our results are generic, and they qualitatively agree in limiting cases with the results of perturbative calculations for disordered spin chains and with the data of experiments on quasi-one-dimensional spin compounds." @default.
- W2029185846 created "2016-06-24" @default.
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- W2029185846 date "2010-09-03" @default.
- W2029185846 modified "2023-10-18" @default.
- W2029185846 title "Low-energy dynamical characteristics of a quantum spin chain with magnetic impurities" @default.
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- W2029185846 doi "https://doi.org/10.1103/physrevb.82.104403" @default.
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