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The pseudo-binary thiospinel system Cu$_{1-x}$Cd$_{x}$Ir$_{2}$S$_{4}$ wasinvestigated by the x-ray diffraction, electrical resistivity, magneticsusceptibility and specific heat measurements. It was shown that the systemexhibits a miscibility-gap behavior for the Cd substitution, however, nearlymonophasic samples was obtained by quenching at 1373 K, except for $0.4< x\leqslant 0.6$. With increasing the Cd concentration, the room-temperatureelectrical conductivity and Pauli susceptibility decrease monotonically,consistent with the hole-filling picture. The first-order metal-insulatortransition at about 230 K in the parent compound CuIr$_{2}$S$_{4}$ is changedinto a second-order transition around 185 K when $x\sim$ 0.25, whereafter thesecond-order transition disappears at $x\sim 0.8$. No superconductivity wasobserved down to 1.8 K. The end-member compound CdIr$_{2}$S$_{4}$ is shown asan insulator with a band-gap of 0.3 eV. Analysis for the data of magneticsusceptibility and electrical resistivity suggests the formation of bipolaronsbelow 185 K for $0.25 <x<$ 0.8, which accounts for the absence ofsuperconductivity in terms of the transition from the BCS Cooper pairs to smallbipolarons.Comment: 7 pages, 9 figure

physical review. b, condensed matter and materials physics

Variation of the metal-insulator transition and formation of bipolarons by Cd doping in the thiospinel system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cd</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:…

Variation of the metal-insulator transition and formation of bipolarons by Cd doping in the thiospinel systemCu1−xCdx