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Open Access New layered manganese selenide KMnAgSe2: Structure and properties

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Single crystal of a new layered manganese selenide KMnAgSe2 was grown by the self-flux method. It adopts a ThCr2Si2-type structure and is isostructural to KMnCuSe2, with Mn and Ag being randomly distributed at the tetrahedral sites formed by Se. The metal–metal distance within the MnAgSe2 layer is much longer than that in KMnCuSe2, resulting in a significant increase in resistivity, with an optical band gap up to 2.02 eV. The observation of spin-glass behavior in KMnAgSe2 and the strong anisotropic expansion of its lattice parameters point out that short metal–metal distance is not necessary for the induction of spin-glass behavior. Rather, magnetic anisotropy measurement on KMnAgSe2 single crystal suggests that the interlayer magnetic interaction is a more critical factor.

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Keywords: HIGH RESISTANCE; LAYERED MANGANESE SELENIDE; METAL–METAL DISTANCE; SPIN GLASS; STRUCTURAL CHARACTERIZATION

Document Type: Short Communication

Publication date: August 1, 2014

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