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The electronic and magnetic properties of K$_{2}$CuP$_{2}$O$_{7}$ wereinvestigated by means of susceptibility, specific heat and $^{31}$P nuclearmagnetic resonance (NMR) measurements and by LDA band structure calculations.The temperature dependence of the NMR shift $K(T)$ is well described by the$S=1/2$ Heisenberg antiferromagnetic chain (HAF) model with nearest neighborexchange $J_{1}$ $\simeq $ $(141\pm 5)$ K. The corresponding mapping of anLDA-derived tight-binding model leads to $J_{1}^{LDA}$ $\simeq$ 196 K. The spinlattice relaxation rate $1/T_{1}$ decreases with temperature below 300 K butbecomes nearly temperature independent between 30 K and 2 K as theoreticallyexpected for an $S = {1/2}$ HAF chain. None of the investigated properties giveany evidence for long range magnetic order above 2K, in agreement with theresults of the band structure calculation, which yield extremely weak exchangeto the next nearest neighbor (NNN) and a very small and frustrated inter-chainexchange. Thus, K$_{2}$CuP$_{2}$O$_{7}$ seems to be a better realization of anearest neighbor $S = {1/2}$ HAF chain than the compounds reported so far.

Electronic and magnetic properties of K$_{2}$CuP$_{2}$O$_{7}$ - a model S=1/2 Heisenberg chain system