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We investigate the influence of an inter-chain coupling on the spiral groundstate correlations of a spin-1/2 Heisenberg model consisting of atwo-dimensional array of coupled chains with nearest (J1) and frustratingnext-nearest neighbor (J2) in-chain exchange couplings. Using thecoupled-cluster method we calculate the transition point between thecommensurate and the incommensurate (spiral) ground state as well as thequantum pitch angle of the spiral ground state. In addition, we provide asimple empirical formula which describes the relation between the quantum pitchangle and the frustration parameter J2/J1.

Influence of an inter-chain coupling on spiral ground-state correlations in frustrated spin-1/2 J1-J2 Heisenberg chains