The characteristics of the nuclear magnetic resonance (NMR), the contributions to the spin-lattice relaxation rate, and Knight shift of the resonance position are calculated exactly for a model spin- $1/2$ $XY$ chain with the magnetic impurity. It is shown that the deviations of the impurity's coupling to the chain and the effective impurity's $g$ factor from the values in the host spin chain yield special features in the temperature and magnetic field behavior for these NMR characteristics. The role of impurity-induced local levels in the NMR low-energy spin dynamics of spin chains is determined.The characteristics of the nuclear magnetic resonance (NMR), the contributions to the spin-lattice relaxation rate, and Knight shift of the resonance position are calculated exactly for a model spin-$1/2$ $XY$ chain with the magnetic impurity. It is shown that the deviations of the impurity's coupling to the chain and the effective impurity's $g$ factor from the values in the host spin chain yield special features in the temperature and magnetic field behavior for these NMR characteristics. The role of impurity-induced local levels in the NMR low-energy spin dynamics of spin chains is determined.

Physical Review BApr 20, 20125 citations

The characteristics of the nuclear magnetic resonance (NMR), the contributions to the spin-lattice relaxation rate, and Knight shift of the resonance position are calculated exactly for a model spin-

1/2

XY

chain with the magnetic impurity. It is shown that the deviations of the impurity's coupling to the chain and the effective impurity's

g

factor from the values in the host spin chain yield special features in the temperature and magnetic field behavior for these NMR characteristics. The role of impurity-induced local levels in the NMR low-energy spin dynamics of spin chains is determined.