Abstract
A new series of layered oxyselenides Nd2(Fe1−xMnx)2Se2O3 (0⩽x⩽0.5) was synthesized via solid state reaction method. Their structure and properties were investigated by the X-ray powder diffraction, magnetic bulk, electrical and thermal transport measurements along with specific heat experiments. The compounds crystallize in the layered tetragonal structure with I4/mmm space group and show semiconducting behavior. The large discrepancy between activation energy for conductivity, Eρ (0.153–0.177eV), and thermopower, ES (7.0–14.8meV), indicates the polaronic transport mechanism. Heat capacity and bulk magnetization indicate an increased ferromagnetic component of the long-range magnetic order and possible increased degree of frustration. Atomic disorder on Fe/Mn sites suppresses the temperature of the long-range order whereas intermediate alloys show a rich magnetic phase diagram.
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