中文摘要：

我们通过自助熔剂法制备了Fe1＋y-xCoxTe（x=0,0.04,0.09）系列单晶,研究了Fe位Co替代效应对Fe1＋yTe母体的磁性、电阻以及比热性质的影响.研究结果表明Co的替代效应明显的抑制了母体Fe1.05Te的反铁磁结构相变,并在低温出现了自旋玻璃态.当掺杂量x=0.09时,电阻率曲线呈现半导体行为.低温比热曲线拟合结果显示费米面附近的态密度随掺杂量变化不大,表明Co对Fe的替代效应主要表现为引入了局域磁矩.

英文摘要：

Here we report a systematic investigation of Co substitution effects on the magnetism, heat capacity and transport properties of Fe1＋yTe single crystals. It is found that the anti-ferromagnetism transition temperature decreases upon Co doping, and a spin-glass like behavior emerges at low temperature. With substituting x=0. 09 Co for Fe, both the metallic behavior and the structural transition disappear. The capacity heat curve fitting shows that the density of states at Fermi-level do not change significantly, which reveals that the Co bring localized magnetic moments into the system.