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首页> 外文期刊>Physical review >YBa_2Cu_3O_7/La_(0.7)Ca_(0.3)MnO_3 bilayers: Interface coupling and electric transport properties
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YBa_2Cu_3O_7/La_(0.7)Ca_(0.3)MnO_3 bilayers: Interface coupling and electric transport properties

机译：YBa_2Cu_3O_7 / La_（0.7）Ca_（0.3）MnO_3双层：界面耦合和电传输性质

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摘要

Heteroepitaxially grown bilayers of ferromagnetic La_(0.7)Ca_(0.3)MnO_3 (LCMO) on top of superconducting YBa_2Cu_3O_7 (YBCO) thin films were investigated by focusing on electric transport properties as well as on magnetism and orbital occupation at the interface. Transport measurements on YBCO single layers and on YBCO/LCMO bilayers, with different YBCO thickness d_Y and constant LCMO thickness d_L=50 nm, show a significant reduction in the superconducting transition temperature T_c only for d_Y< 10 nm, with only a slightly stronger T_c suppression in the bilayers, as compared to the single layers. X-ray magnetic circular dichroism measurements confirm recently published data of an induced magnetic moment on the interfacial Cu by the ferromagnetically ordered Mn ions, with antiparallel alignment between Cu and Mn moments. However, we observe a significantly larger Cu moment than previously reported, indicating stronger coupling between Cu and Mn at the interface. This in turn could result in an interface with lower transparency, and hence smaller spin-diffusion length, that would explain our electric transport data, i.e., smaller T_c suppression. Moreover, linear dichroism measurements did not show any evidence for orbital reconstruction at the interface, indicating that a large change in orbital occupancies through hybridization is not necessary to induce a measurable ferromagnetic moment on the Cu atoms.
机译：研究了超导电YBa_2Cu_3O_7（YBCO）薄膜顶部异质外延生长的铁磁La_（0.7）Ca_（0.3）MnO_3（LCMO）双层，重点研究了电传输性质以及界面处的磁性和轨道占据。在具有不同YBCO厚度d_Y和恒定LCMO厚度d_L = 50 nm的YBCO单层和YBCO / LCMO双层上的传输测量结果表明，仅在d_Y <10 nm时，超导转变温度T_c才显着降低，而T_c则稍强与单层相比，双层中的抑制作用更大。 X射线磁性圆二色性测量结果证实了最近发布的铁磁性有序Mn离子在界面Cu上感应的磁矩的数据，且Cu和Mn矩之间存在反平行排列。但是，我们观察到的铜矩比以前报道的要大得多，表明界面处的铜和锰之间的耦合更强。反过来，这可能导致界面具有较低的透明度，并因此导致较小的自旋扩散长度，这将解释我们的电传输数据，即较小的T_c抑制。此外，线性二向色性测量没有显示界面上有轨道重建的任何证据，这表明通过杂交引起的轨道占有率的大变化对于在Cu原子上诱导可测量的铁磁矩不是必需的。

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  • 来源
    《Physical review》 |2010年第22期|p.401-407|共7页
  • 作者

    R. Werner; C. Raisch; A. Ruosi; B. A. Davidson; P. Nagel; M. Merz; S. Schuppler; M. Glaser; J. Fujii; T. Chasse; R. Kleiner; D. Koelle;

  • 作者单位

    Physikalisches Institut-Experimentalphysik Ⅱ, Universitdt Tuebingen, Auf der Morgenstelle 14, 72076 Tuebingen, Germany;

    Physikalische Chemie, Universitaet Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany;

    Department of Physics, University of Naples Federico Ⅱ, P.Tecchio 80, 80125 Naples, Italy;

    CNR-IOM, TASC National Laboratory, S.S. 14 Km 163.5 in AREA Science Park, 34012 Basovizza, Trieste, Italy;

    Institut fuer Festkoerperphysik, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

    Institut fuer Festkoerperphysik, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

    Institut fuer Festkoerperphysik, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany;

    Physikalische Chemie, Universitaet Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany;

    CNR-IOM, TASC National Laboratory, S.S. 14 Km 163.5 in AREA Science Park, 34012 Basovizza, Trieste, Italy;

    Physikalische Chemie, Universitaet Tuebingen, Auf der Morgenstelle 18, 72076 Tuebingen, Germany;

    Physikalisches Institut-Experimentalphysik Ⅱ, Universitdt Tuebingen, Auf der Morgenstelle 14, 72076 Tuebingen, Germany;

    Physikalisches Institut-Experimentalphysik Ⅱ, Universitdt Tuebingen, Auf der Morgenstelle 14, 72076 Tuebingen, Germany;

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  • 关键词

    X-ray absorption spectra; electronic transport in interface structures; cuprate superconductors (high-Tc and insulating parent compounds); manganites;

    机译：X射线吸收光谱;界面结构中的电子传输;铜酸盐超导体（高Tc和绝缘母体化合物）;锰矿;

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