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Two-band superconductivity in doped SrTiO_3 films and interfaces

机译:掺杂SrTiO_3薄膜和界面中的两波段超导性

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摘要

We investigate the possibility of multiband superconductivity in SrTiO_3 films and interfaces using a two-dimensional two-band model. In the undoped compound, one of the bands is occupied whereas the other is empty. As the chemical potential shifts due to doping by negative charge carriers or application of an electric field, the second band becomes occupied and gives rise to a strong enhancement of the transition temperature and a sharp feature in the gap functions, which is manifested in the local density of states spectrum. By comparing our results with tunneling experiments in Nb-doped SrTiO_3, we find that intraband pairing dominates over interband pairing, unlike other known multiband superconductors. Given the similarities with the value of the transition temperature and with the band structure of LaAlO_3/SrTiO_3 heterostructures, we speculate that the superconductivity observed in SrTiO_3 interfaces may be similar in nature to that of bulk SrTiO_3, involving multiple bands with distinct electronic occupations.
机译:我们使用二维两波段模型研究SrTiO_3薄膜和界面中多波段超导的可能性。在未掺杂的化合物中,一条带被占据,而另一条为空。当化学势由于负电荷载流子的掺杂或电场的施加而移动时,第二个带被占据并引起跃迁温度的强烈提高和间隙函数的明显特征,这在局部可见。国家频谱密度。通过将我们的结果与掺Nb的SrTiO_3中的隧穿实验进行比较,我们发现带内配对在带间配对中占主导地位,这与其他已知的多带超导体不同。考虑到与转变温度的值和LaAlO_3 / SrTiO_3异质结构的能带结构的相似性,我们推测在SrTiO_3界面上观察到的超导性质可能与本体SrTiO_3的性质相似,涉及具有不同电子职业的多个能带。

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  • 来源
    《Physical review》 |2013年第1期|014510.1-014510.6|共6页
  • 作者单位

    Department of Physics, Columbia University, New York, New York 10027, USA,Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA,Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Institute for Condensed Matter Theory and Institute for Nanotechnology, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA,Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA,NORDITA, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23 106 91 Stockholm, Sweden;

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  • 正文语种 eng
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  • 关键词

    multilayers, superlattices, heterostructures; pairing symmetries (other than s-wave); proximity effects; Andreev effect; SN and SNS junctions; effects of crystal defects, doping and substitution;

    机译:多层;超晶格;异质结构;配对对称性(s波除外);邻近效应;安德列夫效应;SN和SNS交界处;晶体缺陷;掺杂和取代的影响;

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