Insulator-metal transition in BaCo0.9Ni0.1S2-ySey

J. W. Schweitzer, L. S. Martinson, N. C. Baenziger, D. C. Swenson, Victor G Young, Ilia Guzei

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14 Scopus citations


Compounds of the Se-doped layered transition-metal sulfide series BaCo0.9Ni0.1S2-ySey (y≤0.4) were prepared and structural, magnetic, and electrical properties were investigated. These compounds exhibit the unusual first-order antiferromagnetic semiconductor to paramagnetic metal transition with decreasing temperature that was previously seen in the sulfur-deficient BaCo1-xNixS2-y series. This transition is associated with a major structural change. The previously unknown crystal structure of the low-temperature phase is reported. Electrical resistance and magnetic susceptibility measurements are used to construct the phase diagram for BaCo0.9Ni0.1S2-ySey. Doping with Se increases the insulator-metal transition temperature, but has very little effect on other properties since it substitutes for S only in the BaS layers.

Original languageEnglish (US)
Pages (from-to)12792-12799
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number19
StatePublished - Nov 15 2000


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