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首页> 外文期刊>Physical review >Magnetic and electronic states in (LaMnO_3)_2(SrMnO_3)_2 superlattice exhibiting a large negative magnetoresistance
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Magnetic and electronic states in (LaMnO_3)_2(SrMnO_3)_2 superlattice exhibiting a large negative magnetoresistance

机译：（LaMnO_3）_2（SrMnO_3）_2超晶格中的磁和电子态表现出较大的负磁阻

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摘要

Magnetic and electronic states in (LaMnO_3)_2(SrMnO_3)_2 superlattices fabricated on an (LaAlO_3)_(0.3)(SrAl_(0.5)Ta_(0.5)O_3)_(0.7) substrate, which exhibit a large nontrivial negative magnetoresistance (MR) effect, have been investigated. The crystal structure and the Mn valence state were determined using x-ray scattering measurements near the Mn K edge. These measurements revealed that the Mn valences in the LaMnO_3 and SrMnO_3 layers are 3+ and 4+, respectively; that is, valence modulation coincides with the La/Sr stacking structure. The Mn spin structure was studied by means of resonant soft x-ray scattering at the Mn L_(2,3) edge and neutron magnetic scattering measurements. We succeeded in detecting a magnetic signal indicating ferromagnetism at the interface. Finally, we suggest that the origin of the MR is the competition between ferromagnetism at the interface and underlying antiferromagnetism.
机译：在（LaAlO_3）_（0.3）（SrAl_（0.5）Ta_（0.5）O_3）_（0.7）衬底上制造的（LaMnO_3）_2（SrMnO_3）_2超晶格中的磁和电子态，表现出大的非平凡的负磁阻（MR） ）效果，已经过调查。使用靠近Mn K边缘的X射线散射测量来确定晶体结构和Mn价态。这些测量表明，LaMnO_3和SrMnO_3层中的Mn价分别为3+和4+。即，价态调制与La / Sr堆叠结构一致。通过在Mn L_（2,3）边缘的共振软X射线散射和中子磁散射测量研究了Mn自旋结构。我们成功地在接口处检测到指示铁磁性的磁信号。最后，我们认为MR的起源是界面处的铁磁性与潜在的反铁磁性之间的竞争。

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  • 来源
    《Physical review》 |2015年第24期|245104.1-245104.8|共8页
  • 作者

    Hironori Nakao; Takaaki Sudayama; Masato Kubota; Jun Okamoto; Yuichi Yamasaki; Youichi Murakami; Hiroyuki Yamada; Akihito Sawa; Kazuaki Iwasa;

  • 作者单位

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan,Quantum Beam Science Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan,National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan,Department of Applied Physics and Quantum-Phase Electronics Center, The University of Tokyo, Tokyo 113-8656, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan;

    National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan;

    National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

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  • 正文语种 eng
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  • 关键词

    magnetic properties of interfaces (multilayers, superlattices, heterostructures); magnetic properties of thin films, surfaces, and interfaces; superlattices;

    机译：界面的磁性（多层;超晶格;异质结构）;薄膜;表面和界面的磁性能;超晶格;

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