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Transport and Magnetic Studies of New Mixed-Valence Compounds: K_{3}Cu_{8}Se_{6}, KCu_{3}Se_{2}, K_{3}Cu_{8}Te_{6} and BaCuS_{3-x}

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Jacyna-Onyszkiewicz I., Sidowski M., Starodub W., Ratuszna A., Robaszkiewicz S.

Acta Physica Polonica A

1997

vol. 91

issue 2

405-408

New mixed-valent copper chalcogenides BaCuS_{3-x} and K_{3}Cu_{8}X_{6} with X=Se or Te and KCu_{3}Se_{2}, with chemical patterns corresponding to the recently investigated K_{3}Cu_{8}S_{6} and KCu_{3}S_{2}, were synthesized. For these new samples the results of resistivity and magnetic susceptibility measurements are presented. For BaCuS_{3-x}, K_{3}Cu_{8}Se_{6} and KCu_{3}Se_{2} the metal-insulator transition is observed with the low temperature phase being metallic, which is untypical, whereas K_{3}Cu_{8}Te_{6} is a metal in the investigated temperature range. The temperature dependence of magnetic susceptibility of the studied samples testifies to their diamagnetic or weakly paramagnetic behaviour.

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1 Acta Physica Polonica A

1 1997

1 Jacyna-Onyszkiewicz I.

1 Ratuszna A.

1 Robaszkiewicz S.

1 Sidowski M.

1 Starodub W.

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Transport and Magnetic Studies of New Mixed-Valence Compounds: K_{3}Cu_{8}Se_{6}, KCu_{3}Se_{2}, K_{3}Cu_{8}Te_{6} and BaCuS_{3-x}