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Co(S1-xSex)2系统中的铁磁量子相变

杨金虎 王杭栋 杜建华 张瞩君 方明虎

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Co(S1-xSex)2系统中的铁磁量子相变

杨金虎, 王杭栋, 杜建华, 张瞩君, 方明虎

Ferromagnetic quantum phase transition in Co(S1-xSex)2 system

Yang Jin-Hu, Wang Hang-Dong, Du Jian-Hua, Zhang Zhu-Jun, Fang Ming-Hu
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  • 针对Co(S1-xSex)2系统在x=0.11附近发生的铁磁金属到顺磁金属相变,制备了一系列不同Se替代浓度的多晶样品.通过对其结构和电阻率-温度ρ(T)关系的系统观测,结果发现,样品铁磁相变温度TC随着Se替代浓度x值的增加,以(1-x)1/2关系单调下降,其二级铁磁相变转变为一级相变
    In Co(S1-xSex)2 system, a transition from ferromagnetic to paramagnetic state occurs near x = 0.11. In order to research the physical properties of the samples near this transition, polycrystalline samples of Co(S1-xSex)2 (0.0≤x≤0.16) were prepared. And their structure and resistivity were measured. It is found that the ferromagnetic transition temperature TC is suppressed by Se doping in the relation TC~(1-x)1/2. And the ferromagnetic phase transition goes from the second to the first order. The temperature dependence of resistivity, ρ(T), shows a Fermi-liquid behavior, ρ(T)=ρ0+AT2, in Co(S1-xSex)2 (xρ(T) occurs in the samples near a critical concentration x=0.11. It is suggested that the phase transition near x=0.11 is a quantum phase transition, and the quantum critical spin fluctuation at zero temperature results in non-Fermi liquid behavior.
    • 基金项目: 国家重点基础研究发展计划(批准号: 2006CB601003)和教育部长江者和创新团队发展计划(批准号: IRT0754)资助的课题.
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  • 文章访问数:  8682
  • PDF下载量:  1079
  • 被引次数: 0
出版历程
  • 收稿日期:  2008-07-16
  • 修回日期:  2008-08-16
  • 刊出日期:  2009-01-05

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