Antiferromagnetic-to-ferromagnetic transition in metallic Tl1−xKxCo2Se2 (0 ⩽ x ⩽ 1.0) with ThCr2Si2-type structure

Dedicated to Professor LeRoy Eyring on the occasion of his 70th birthday.
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Abstract

Solid solutions of Tl1−xKxCo2Se2 (0 ⩽ x ⩽ 1.0) were prepared by high temperature solid state reactions. All the samples are highly metallic (ρ ≈ 10−4–10−5 Ω cm). The magnetic phase diagram was determined by magnetic susceptibility measurements: the thallium-rich phases (0 ⩽ x ⩽ 0.45) order antiferromagnetically, the potassium-rich phases (0.55 ⩽ x ⩽ 1.0) order ferromagnetically, and the intermediate phases (x = 0.50) show competition between antiferromagnetic and ferromagnetic behavior. The possible mechanism of the transition from antiferromagnetic to ferromagnetic behavior is discussed.

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