Abstract
We have investigated the magnetic ground state of a novel one-dimensional compound, NaCr2O4, in which Cr2O4 double chains, i.e. zig-zag chains are aligned parallel to the b-axis, by means of both muon-spin rotation and relaxation (μ+SR) and neutron diffraction (ND) measurements. The μ+SR results reveal the formation of static antiferromagnetic order below Néel temperature (TN=124K). The ND measurements also demonstrate the appearance of magnetic Bragg peaks with the propagation vector k→=(1, 0, 1) below TN. Combined analyses of the μ+SR and ND data clarify that the Cr moments in each zig-zag chain are aligned ferromagnetically along the c-axis, whereas antiferromagnetically along the a-axis between the adjacent zig-zag chains.
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