烧绿石Bi2-xFexIr2O7的金属-绝缘体转变与增强的反铁磁性研究

低温物理学报 , 2017, 39(2): 43-49.

烧绿石Bi2-xFexIr2O7的金属-绝缘体转变与增强的反铁磁性研究

边健 ^1, , 朱守金 ^2, , 陈仕云 ^3, , 丰远 ^4, , 马翠玲 ^5, , 方保龙 ^6, , 刘慧 ^7,

1.合肥学院数学与物理系,合肥,230601

2.三联学院大学物理实验室,合肥,230601

3.合肥学院分析测试中心,合肥,230601

4.合肥学院数学与物理系,合肥,230601

5.合肥学院建筑工程系,合肥,230601

6.合肥学院数学与物理系,合肥,230601

7.合肥学院数学与物理系,合肥,230601

基金项目: Natural Science Foundation of Hefei University(Grant nos.16ZR06ZDB,15RC13,15KY01ZD,16YQ01RC and 2016dtr02) the Natural Science Foundation of China(Grant no.11604071) Natural Science Foundation of the Education Department of Anhui Province(Grant nos.KJ2016SD49,2016jyxm0864 and 2016jyxm0865)

关键词： Bi2-xFexIr2O7 , 金属-绝缘体转变 , 反铁磁性 , 类自旋玻璃态转变

Metal-insulator Transition and Enhanced Anti ferromagnetism in Pyrochlore Iridate Bi2-xFexIr2O7

Keywords： Bi2-xFexIr2O7 , metal-insulator transition , antiferromagnetism , spin-glass-like transition

通过晶体结构、电学和磁学测量,我们系统地研究了Fe掺杂的烧绿石Bi2-xFexIr2o7(x=0.1,0.2,0.3,0.4)样品.X射线衍射证实了高结晶的Bi2-xFex Ir2 07保持立方结构.样品体系显示出金属-绝缘体转变:当x=0.1,转变温度为63.870 K.随着Fe含量的增加,转变温度呈上升趋势.掺杂样品显示出增强的反铁磁性,并随着Fe掺杂增加,反铁磁性增强.当掺杂量增加到0.3时,样品发生类自旋玻璃态转变.

We report a systematic study of Fe-doped Bi2-x Fex Ir2 O7 (x =0.1,0.2,0.3 and 0.4) by performing crystal structure,electrical transport and magnetic measurements.The X-ray diffraction confirms that the highcrystallized Bi2-xFex Ir2O7 is a cubic structure.The system shows metal-insulator transition:for x =0.1,the transition temperature is 63.870 K.With increasing content of Fe doping,the transition temperature shows an upward trend.Magnetic measurements on the doping samples indicate an enhanced antiferromagnetism with Fe doping.When the doping content increases up to 0.3,a spin-glass-like transition occurs.

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