Co掺杂La5/8Ca3/8MnO3体系的结构和输运特性研究

低温物理学报 , 2005, 27(2): 141-147. doi: 10.3969/j.issn.1000-3258.2005.02.008

Co掺杂La5/8Ca3/8MnO3体系的结构和输运特性研究

姚恺 ^1, , 曹桂新 ^2, , 康保娟 ^3, , 沙燕娜 ^4, , 曹世勋 ^5, , 敬超 ^6, , 张金仓 ^7,

1.上海大学物理系,上海,200436;新乡师范高等专科学校物理系,新乡,453000

2.上海大学物理系,上海,200436

3.上海大学物理系,上海,200436

4.上海大学物理系,上海,200436

5.上海大学物理系,上海,200436

6.上海大学物理系,上海,200436

7.上海大学物理系,上海,200436

基金项目: 上海市教委"曙光计划"(03SG35) 国家自然科学基金(10274049) 上海市教委资助项目上海市教委资助项目(02AK42)

关键词： La5/8Ca3/8MnO3体系 , Co掺杂 , 晶体结构 , 输运特性

STUDY OF STRUCTURE AND TRANSPORTPROPERTIES FOR Co DOPED La5/8Ca3/8MnO3 SYSTEM

系统研究了La5/8Ca3/8Mn1-xCoxO3(0.0≤x≤0.3)体系的结构和输运特性.结果表明,随着Co掺杂浓度的增加,体系的晶胞体积单调减小,并出现正交到四方的结构变化;绝缘体-金属转变(I～M)温度TIM向低温区移动,对应的峰值电阻率ρp急剧升高.在高温区(T>TIM)体系的输运特性满足可变程跃迁模型,对低浓度掺杂(x≤0.1)样品,具有典型的绝缘-金属转变行为,在低温区(T

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Co掺杂La5/8Ca3/8MnO3体系的结构和输运特性研究

STUDY OF STRUCTURE AND TRANSPORTPROPERTIES FOR Co DOPED La5/8Ca3/8MnO3 SYSTEM

参考文献