Large negative magnetoresistance in thiospinel CuCrZrS4

Abstract

We report on large negative magnetoresistance observed in ferromagnetic thiospinel compound

Magnetic and thermodynamic properties of the thiospinel compoundCuCrZrS4

“…21 This behavior can be explained by a variable range-hopping ͑VRH͒ conduction. 31 This means that the number of conduction electrons in CuCrZrS 4 decrease with decreasing temperature. The decrease in the number of conduction electrons gives rise to the reduction of the doubleexchange interaction and relative enhancement of the superexchange antiferromagnetic interaction between Cr 3+ cations via S 2− anions at low temperature.…”

Spin-liquid behavior in the spinel-type Cu(Cr1−xZrx)2S4

“…The asymptotic Curie temperature of CuCrZrS 4 drops down to yE62 K with an effective number of Bohr magnetons p eff ¼ 3.70/Cr-atom, and a spin-glass phase is observed below 10 K. No sign of peak in the heat capacity near 62 K is found [3], which indicates that longrange order is absent below 62 K, otherwise the process of order is spread over an extremely wide temperature range. Large negative magnetoresistance has been observed [4].…”

High frequency ESR measurements of thiospinel CuCrZrS>inf<4>/inf<

“…Similar CMR effects have been observed in Fel,CuxCr2S4 -Cr-based chalcogenide spinelsthat do not possess heterovalency, distortion-including ions, manganese, oxygen or a perovskite structure [1]. Recently, CMR effects have been observed in a new chalcogenide spinel CuCrZrS4 [2]. This CuCrZrS4 has been synthesized by a solid-state chemical reaction [3].…”