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Metal-insulator transition in thiospinel CuIr2S4 by Shoichi Nagata; Takatsugu Hagino; Yoshitaka Seki; Teruo Bitoh is a Physics and Astronomy article available to read on EtoBox.

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We have discovered the existence of metal-insulator transition at ~220 K in the new thiospinel CuIr2S 4. The electrical conductivity, a, for sintered-powder specimens drops abruptly from 2×102 S,cm -1 to 5×10-1S'cm -1 at TM\_I-~220 K with decreasing temperature. At temperatures T<TM\_ I, CuIr2S 4 exhibits a semiconductive behavior with thermally activated conductivity, which is fitted by the formula: a : Aexp(-q/kBT). The slope of the lna vs 1/T curve just below the transition gives an activation energy of q : 4.7× 10 -2 eV for the conduction.

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Author

Shoichi Nagata; Takatsugu Hagino; Yoshitaka Seki; Teruo Bitoh

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-4526)

Published

1994

Language

EN

Field

Physics and Astronomy (Physical Sciences)