Next Nearest-Neighbor Correlation Functions of the Spin-1/2 XXZ Chain at Massive Region

The second neighbor correlation functions of the spin-$1\mathrm{/}2$ $XXZ$ chain in the ground state are expressed in the form of three dimensional integrals. We show that these integrals can be reduced to one-dimensional ones and thereby evaluate the values of the next nearest-neighbor correlation functions for $\mathrm{\Delta }>1$.