[1]刘江山,马建明,刘志海,等.磁性杂质在铁基超导体中引起的隙内束缚态[J].四川师范大学学报(自然科学版),2019,(05):678-690.[doi:10.3969/j.issn.1001-8395.2019.05.017]
 LIU Jiangshan,MA Jianming,LIU Zhihai,et al.In-gap Bound States Induced by a Magnetic Impurity in Iron-based Superconductors[J].Journal of SichuanNormal University,2019,(05):678-690.[doi:10.3969/j.issn.1001-8395.2019.05.017]
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磁性杂质在铁基超导体中引起的隙内束缚态()
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《四川师范大学学报(自然科学版)》[ISSN:1001-8395/CN:51-1295/N]

卷:
期数:
2019年05期
页码:
678-690
栏目:
基础理论
出版日期:
2019-07-15

文章信息/Info

Title:
In-gap Bound States Induced by a Magnetic Impurity in Iron-based Superconductors
文章编号:
1001-8395(2019)05-0678-13
作者:
刘江山1 马建明1 刘志海2 郑铁军3 张德刚1*
1.四川师范大学 物理与电子工程学院, 四川 成都 610101; 2.中山大学 物理学院, 广东 广州 510275; 3.成都纺织高等专科学校 基础部, 四川 成都 611731
Author(s):
LIU Jiangshan1 MA Jianming1 LIU Zhihai2 ZHENG Tiejun3 ZHANG Degang1
1.College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, Sichuan; 2.College of Physics, Zhongshan University, Guangzhou 510275, Guangdong; 3.Department of Fundamental Education, Chengdu Textile College, Chengdu 611731,
关键词:
铁基超导体 超导序参量 磁性杂质 超导隙内束缚态
Keywords:
iron-based superconductor superconducting order parameter magnetic impurity bound states in superconducting gap
分类号:
O469
DOI:
10.3969/j.issn.1001-8395.2019.05.017
文献标志码:
A
摘要:
基于两轨道四带紧束缚模型,研究铁基超导体中单个磁性杂质对局域态密度的影响,并得到杂质共振峰的高度、位置与混合势的关系.在杂质点附近,在一定的磁性杂质势下存在零能共振峰,超导相干峰也受到抑制.随着磁性势的变化,零能共振峰发生劈裂.发现在非磁性势Vs一定、磁性势Vm=|Vm|时,局域态密度曲线基本相同,并且在一定的杂质势范围内正负能侧杂质共振峰是对称的,也注意到局域态密度显示较强的磁性或非磁性杂质势的特征.
Abstract:
Based on the two-orbit four-band tight binding model, we investigate the impact of a single magnetic impurity on the local density of states in the iron-based superconductors, and obtain the relation between the intensities and positions of the impurity resonance peaks and the strength of the mixed impurity potential.Near the impurity point, the zero energy resonance peak is induced at certain strength of the magnetic impurity, and the superconducting coherent peaks are suppressed.The zero energy peak splits with the variation of the magnetic impurity potential.It is also found that the curves of local density of states are basically the same at the magnetic potentials Vm = | Vm | when the nonmagnetic potential Vm | when the nonmagnetic potential b>s is fixed, and the resonance peaks at the positive and negative energy sides are symmetrical in a certain range of impurity potential.We also observe that the local density of states shows the features of the stronger magnetic or nonmagnetic impurity potential.

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相似文献/References:

[1]刘志海,刘江山,马建明,等.铁基超导体中非磁性杂质引起的隙内束缚态[J].四川师范大学学报(自然科学版),2017,(05):666.[doi:10.3969/j.issn.1001-8395.2017.05.018]
 LIU Zhihai,LIU Jiangshan,MA Jianming,et al.In-gap Bound States Induced by a Nonmagnetic Impurity in Iron-based Superconductors[J].Journal of SichuanNormal University,2017,(05):666.[doi:10.3969/j.issn.1001-8395.2017.05.018]

备注/Memo

备注/Memo:
收稿日期:2017-09-25 接受日期:2017-11-28
基金项目:四川省“千人计划”项目(34125003)
*通信作者简介:张德刚(1962—),男,教授,主要从事超导理论、拓扑绝缘体等的研究,E-mail:degangzhang@yahoo.com
更新日期/Last Update: 2019-07-15