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物理学报. 2009, 58(2): 1195-1199.
doi: 10.7498/aps.58.1195.
Co(S1-xSex)2系统中的铁磁量子相变
- 收稿日期: 2008-07-16
- 修回日期: 2008-08-16
- 刊出日期: 2009-01-05
摘要: 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
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关键词:
- 量子相变 /
- 自旋量子涨落 /
- Co(S1-xSex)2
English Abstract
Ferromagnetic quantum phase transition in Co(S1-xSex)2 system
- Received Date:
16 July 2008
- Accepted Date:
16 August 2008
- Published Online:
05 January 2009
Abstract: 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.
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