Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor
Effects of proton irradiation on flux-pinning properties of underdoped Ba(Fe0.96Co0.04)2As2 pnictide superconductor
复制标题
质子辐照对欠掺杂Ba(Fe0.96Co0.04)2As2磷族超导体通量钉扎性能的影响
DOI：
10.1016/j.jallcom.2016.10.103
复制
发表时间：
2017
影响因子：
6.2
通讯作者：
Salem-Sugui S
中科院分区：
文献类型：
--
作者：
Salem-Sugui S
本文用磁化强度和磁电阻率的联合测量方法研究了质子辐照对Ba（Fe_（0.96）Co_（0.04））_2As_2超导单晶的影响。该研究允许提取的值的表观钉扎energyU0的样品之前和之后的照射，以及比较的值ofU0从磁通流可逆区域与磁通蠕变不可逆区域。照射reducesTc温和，但显着reducesU0在这两个制度：临界电流densityJcis修改，最引人注目的是照射后的第二磁化峰消失。分析的钉扎力的函数形式和温度依赖性ofJC为零场，表明质子辐照在这种情况下并没有改变钉扎制度，但引入了高密度的浅点状缺陷。通过考虑一个模型，考虑到无序的不可逆线的影响，数据表明，照射产生了相当大的减少，在平均有效的障碍整体，与观察到的变化在U0和Jc。
We study the effect of proton irradiation on Ba(Fe0.96Co0.04)2As2superconducting single crystals from combined magnetisation and magnetoresistivity measurements. The study allows the extraction of the values of the apparent pinning energyU0of the samples prior to and after irradiation, as well as comparison of the values ofU0obtained from the flux-flow reversible region with those from the flux-creep irreversible region. Irradiation reducesTcmodestly, but significantly reducesU0in both regimes: the critical current densityJcis modified, most strikingly by the disappearance of the second magnetisation peak after irradiation. Analysis of the functional form of the pinning force and of the temperature dependence ofJcfor zero field, indicates that proton irradiation in this case has not changed the pinning regime, but has introduced a high density of shallow point-like defects. By considering a model that takes into account the effect of disorder on the irreversibility line, the data suggests that irradiation produced a considerable reduction in the average effective disorder overall, consistent with the changes observed inU0andJc.