Abstract
Single crystals of the ternary iron selenide ${\mathrm{RbFeSe}}_{2}$ have been investigated by means of x-ray diffraction, magnetic susceptibility, magnetization, and specific-heat measurements as well as by M\ossbauer spectroscopy. Built up from linear chains of edge-sharing ${\mathrm{FeSe}}_{4}$ tetrahedra, ${\mathrm{RbFeSe}}_{2}$ represents a quasi-one-dimensional antiferromagnet. Below ${T}_{\mathrm{N}}=248$ K three-dimensional antiferromagnetic collinear magnetic order sets in, with the magnetic moments oriented perpendicularly to the chain direction. The hyperfine fields determined from our M\ossbauer studies reveal strongly reduced magnetic moments. The high-temperature susceptibility data of ${\mathrm{RbFeSe}}_{2}$ suggest a one-dimensional metallic character along the chains.
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