Giant magnetoresistance in layered manganese pnictide CaMnBi2
Giant magnetoresistance in layered manganese pnictide CaMnBi2
复制标题
层状锰氮族化合物 CaMnBi2 中的巨磁阻
DOI：
10.1063/1.3694760
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发表时间：
2012-03-12
影响因子：
4
通讯作者：
Chen, G. F.
中科院分区：
文献类型：
--
作者：
He, J. B.;Wang, D. M.;Chen, G. F.
我们报告的物理性质的层状过渡金属磷属元素化物，CaMnBi 2，它具有类似的超导铁磷属元素化物的晶体结构。这种化合物是一种坏金属，在TN = 270 K时具有长程反铁磁序。TN以上的磁化率的线性温度依赖性表明，强的反铁磁关联存在于顺磁状态。磁电阻的线性磁场依赖性意味着线性能量色散的存在，这可能导致巨大的面内磁电阻（约105%，在10 T，2.5 K的H c）。德哈斯-范阿尔芬效应的结果与狄拉克费米子的存在是一致的。
We report the physical properties of a layered transition metal pnictide, CaMnBi2, which has a crystal structure similar to that of the superconducting iron pnictides. This compound is a bad metal with a long-range antiferromagnetic order at TN = 270 K. The linear temperature dependence of magnetic susceptibility above TN suggests that strong antiferromagnetic correlations exist in the paramagnetic state. A linear magnetic field dependence of the magnetoresistance implies the existence of the linear energy dispersion, which may result in the giant in-plane magnetoresistance (about 105% in 10 T at 2.5 K for H∥c). The results of de Haas-van Alphen effect are consistent with the presence of Dirac fermions.