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Multiband superconductivity and nanoscale inhomogeneity at oxide interfaces

机译：氧化物界面处的多带超导性和纳米级不均匀性

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摘要

The two-dimensional electron gas at the LaTiO_3/SrTiO_3 or LaAlO_3/SrTiO_3 oxide interfaces becomes superconducting when the carrier density is tuned by gating. The measured resistance and superfluid density reveal an inhomogeneous superconductivity resulting from percolation of filamentary structures of superconducting "puddles" with randomly distributed critical temperatures, embedded in a nonsuperconducting matrix. Following the evidence that superconductivity is related to the appearance of high-mobility carriers, we model intrapuddle superconductivity by a multiband system within a weak coupling BCS scheme. The microscopic parameters, extracted by fitting the transport data with a percolative model, yield a consistent description of the dependence of the average intrapuddle critical temperature and superfluid density on the carrier density.
机译：当通过选通调整载流子密度时，LaTiO_3 / SrTiO_3或LaAlO_3 / SrTiO_3氧化物界面处的二维电子气变得超导。测得的电阻和超流体密度显示出非均匀的超导性，该超导性是由于超导“水坑”的丝状结构渗透到非超导基质中而形成的，该结构具有随机分布的临界温度。根据超导性与高迁移率载波的出现有关的证据，我们在弱耦合BCS方案内通过多频带系统对内含超导性进行建模。通过将渗漏数据与渗滤模型拟合而提取的微观参数可以得出一致的描述，即平均内部临界温度和超流体密度对载流子密度的依赖性。

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  • 来源
    《Physical review》 |2013年第2期|020504.1-020504.5|共5页
  • 作者

    S. Caprara; J. Biscaras; N. Bergeal; D. Bucheli; S. Hurand; C. Feuillet-Palma; A. Rastogi; R. C. Budhani; J. Lesueur; M. Grilli;

  • 作者单位

    Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro 5, 00185 Roma, Italy,ISC-CNR and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Maleria, Unita di Roma 'Sapienza', Roma, Italy;

    LPEM-UMR8213/CNRS-ESPCI Paris Tech, UPMC, 10 rue Vauquelin, 75005 Paris, France;

    LPEM-UMR8213/CNRS-ESPCI Paris Tech, UPMC, 10 rue Vauquelin, 75005 Paris, France;

    Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro 5, 00185 Roma, Italy;

    LPEM-UMR8213/CNRS-ESPCI Paris Tech, UPMC, 10 rue Vauquelin, 75005 Paris, France;

    LPEM-UMR8213/CNRS-ESPCI Paris Tech, UPMC, 10 rue Vauquelin, 75005 Paris, France;

    Department of Physics, Condensed Matter - Low Dimensional Systems Laboratory, Indian Institute of Technology Kanpur. Kanpur, 208016, India;

    Department of Physics, Condensed Matter - Low Dimensional Systems Laboratory, Indian Institute of Technology Kanpur. Kanpur, 208016, India,National Physical Laboratory, New Delhi, 110012, India;

    LPEM-UMR8213/CNRS-ESPCI Paris Tech, UPMC, 10 rue Vauquelin, 75005 Paris, France;

    Dipartimento di Fisica, Universita di Roma 'La Sapienza', Piazzale Aldo Moro 5, 00185 Roma, Italy,ISC-CNR and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Maleria, Unita di Roma 'Sapienza', Roma, Italy;

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  • 正文语种 eng
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  • 关键词

    inhomogeneous superconductors and superconducting systems; theories and models of superconducting state; superconducting films and low-dimensional structures;

    机译：不均匀的超导体和超导系统;超导状态的理论和模型;超导膜和低维结构;

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