Magneto-optical study of Ba(Fe1-xMx)2As2 (M=Co and Ni) single crystals irradiated with heavy ions
Magneto-optical study of Ba(Fe1-xMx)2As2 (M=Co and Ni) single crystals irradiated with heavy ions
复制标题
DOI：
10.1103/physrevb.81.094509
复制
发表时间：
2010-03-01
影响因子：
3.7
通讯作者：
Kwok, W. K.
中科院分区：
文献类型：
--
作者：
Prozorov, R.;Tanatar, M. A.;Kwok, W. K.
用1.4GeV的Pb-208（56+）离子辐照最佳掺杂的Ba（Fe_（1-x）M_x）（2）As-2（M=Co，Ni）单晶，辐照剂量分别对应于匹配场B_φ =0.1，0.5，1和2 T。磁光成像已被用来映射在辐照样品中的磁感应强度的分布。成像由磁化测量补充。结果表明，大得多的Bean穿透场和磁滞磁化强度的增加所揭示的表观临界电流密度的大幅增强。然而，效果取决于化合物、温度和施加的磁场。在Ba（Fe0.926Co0.074）（2）As-2晶体中，在15 K和低场下，增强似乎与辐照剂量成比例，约为0.27 T-1，而在Ba（Fe0.954Ni0.046）（2）As-2晶体中，较高的辐照剂量效果较差。MA.cm我们的研究结果表明，中等强度的重离子辐照是一种有效的方法，以均匀地提高磷属元素化物超导体的电流currying能力。
Optimally doped single crystals of Ba(Fe1-xMx)(2)As-2 (M=Co, Ni) were irradiated with 1.4 GeV Pb-208(56+) ions at fluences corresponding to matching fields of B-phi=0.1, 0.5, 1, and 2 T. Magneto-optical imaging has been used to map the distribution of the magnetic induction in the irradiated samples. The imaging is complemented by the magnetization measurements. The results show a substantial enhancement of the apparent critical current densities as revealed by the much larger Bean penetration fields and an increase in the hysteretic magnetization. However, the effect depends on the compound, temperature, and applied magnetic field. In Ba(Fe0.926Co0.074)(2)As-2 crystals, at 15 K and low fields, the enhancement appears to scale with the irradiation dose at a rate of about 0.27 MA.cm(-2) T-1, whereas in Ba (Fe0.954Ni0.046)(2)As-2 crystals, higher irradiation doses are less effective. Our results suggest that moderate irradiation with heavy ions is an effective way to homogeneously enhance the current-currying capabilities of pnictide superconductors.