Abstract
The materials with quasi-one-dimensional crystal structure have gained intense interest because of their novel structure and related properties such as electron correlations, charge-density wave and potential superconductivity. Here we report two new Ni-based quasi-one-dimensional selenides: Rb0.9Ni3.1Se3 and K0.7Ni3.1Se3. These two compounds are nonstoichiometric and composed of one-dimensional (Ni3Se3)∞ infinite chains with face-sharing Ni6 octahedra along the c direction. It is found that the interchain distance in these compounds is strongly influenced by the radius of intercalated alkali-metal cations, while the configuration of (Ni3Se3)∞ chains is basically unaffected. The conductivity measurement indicates the metallic behavior of Rb0.9Ni3.1Se3 and K0.7Ni3.1Se3. Meanwhile, the magnetic susceptibility reveals the spin-glass state below 10 K. It is indicated that the magnetic moments in these compounds are related to the NiNi bonding distance. First-principles calculation reproduces the metallic state of this 133 phase, and also suggests that the magnetic interaction is attributed to the extra Ni in structure. These compounds form a Ni-based quasi-one-dimensional material family, which provides new platform to understand the structure-property relationship of quasi-one-dimensional materials, and also offer a series of potential precursors to synthesis the novel (Ni3Se3)∞ molecular wires.
Published Version
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