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首页> 外文期刊>Physical review >Electron-doped Sr_2IrO_(4-δ) (0≤δ≤0.04): Evolution of a disordered J_(eff)=1/2 Mott insulator into an exotic metallic state
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Electron-doped Sr_2IrO_(4-δ) (0≤δ≤0.04): Evolution of a disordered J_(eff)=1/2 Mott insulator into an exotic metallic state

机译：电子掺杂的Sr_2IrO_（4-δ）（0≤δ≤0.04）：无序J_（eff）= 1/2 Mott绝缘子演变为外来金属态

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摘要

Stoichiometric Sr_2IrO_4 is a ferromagnetic J_(eff)= 1/2 Mott insulator driven by strong spin-orbit coupling. Introduction of very dilute oxygen vacancies into single-crystal Sr_2IrO_(4-δ) with δ≤0.04 leads to significant changes in lattice parameters and an insulator-to-metal transition at T_(MI)=105 K. The highly anisotropic electrical resistivity of the low-temperature metallic state for δ≈0.04 exhibits anomalous properties characterized by non-Ohmic behavior and an abrupt current-induced transition in the resistivity at T~*=52 K, which separates two regimes of resistive switching in the nonlinear I-V characteristics. The novel behavior illustrates an exotic ground state and constitutes a new paradigm for devices structures in which electrical resistivity is manipulated via low-level current densities ～10 mA/cm~2 (compared to higher spin-torque currents ～10~7-10~8 A/cm~2) or magnetic inductions ～0.1-1.0 T.
机译：化学计量比Sr_2IrO_4是强自旋轨道耦合驱动的铁磁J_（eff）= 1/2 Mott绝缘子。在δ≤0.04的单晶Sr_2IrO_（4-δ）中引入非常稀的氧空位会导致晶格参数发生显着变化，并在T_（MI）= 105 K时发生绝缘体到金属的转变。 δ≈0.04的低温金属态表现出异常性质，其特征是非欧姆行为和在T〜* = 52 K时电阻率突然由电流引起的跃迁，从而在非线性IV特性中将电阻切换的两种状态分开了。这种新颖的行为说明了一种奇异的基态，并构成了一种器件结构的新范例，在该器件结构中，电阻率是通过低水平的电流密度〜10 mA / cm〜2（与更高的自旋转矩电流〜10〜7-10〜 8 A / cm〜2）或磁感应强度〜0.1-1.0 T.

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  • 来源
    《Physical review》 |2010年第11期|p.115117.1-115117.5|共5页
  • 作者

    O. B. Korneta; rnTongfei Qi; rnS. Chikara; rnS. Parkin; rnL. E. De Long; rnP. Schlottmann; rnG. Cao;

  • 作者单位

    Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA;

    rnCenter for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA;

    rnCenter for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA;

    rnCenter for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, USA;

    rnCenter for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA;

    rnDepartment of Physics, Florida State University, Tallahassee, Florida 32306, USA;

    rnCenter for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA;

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  • 关键词

    metal-insulator transitions and other electronic transitions; spin-orbit coupling, zeeman and stark splitting, jahn-teller effect; intrinsic properties of magnetically ordered materials;

    机译：金属-绝缘体过渡和其他电子过渡;自旋轨道耦合;塞曼和斯塔克分裂;詹恩-泰勒效应;磁性有序材料的固有特性;

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