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首页> 外文期刊>Physical review >Theoretical study of the thickness dependence of the metal-insulator transition in Bi_2Sr_2Co_2O_8 nanosheets
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Theoretical study of the thickness dependence of the metal-insulator transition in Bi_2Sr_2Co_2O_8 nanosheets

机译：Bi_2Sr_2Co_2O_8纳米片中金属-绝缘体跃迁的厚度依赖性的理论研究

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摘要

The bulk Bi_2Sr_2Co_2O_8 crystal is an insulator at low temperature and experiences an insulator-metal transition at T_c ≈ 60 K. The new experiment showed that T_C increases to 140 K for a mechanically exfoliated nanosheet of four blocks and is beyond room temperature for nanosheets thinner than four blocks. We show that the thickness-dependent insulator-metal transition observed in Bi_2Sr_2Co_2O_8 nanosheets can naturally be explained by the strongly correlated low-spin-state insulator (LS state) and intermediate-spin-low-spin-state metal (IS-LS state). In particular, the energy difference between the LS state and IS-LS state qualitatively reproduces the trend of the transition temperature with the nanosheet thickness. The predicted transition temperature of a nanosheet with three blocks is only slightly above room temperature, a result that can be used to check our proposed mechanism. Further experiments on the distinct magnetotransport properties and spin-fluctuation behaviors of the LS state and IS-LS state are also very helpful to resolve the issue. The weak interblock binding is also consistent with the layer-resolved partial densities of states.
机译：块状Bi_2Sr_2Co_2O_8晶体在低温下是绝缘体，在T_c≈60 K时经历绝缘体-金属转变。新实验表明，机械剥落的四块纳米片的T_C增加到140 K，对于比纳米片薄的纳米片，室温超过室温。四个街区。我们表明，Bi_2Sr_2Co_2O_8纳米片中观察到的厚度依赖性绝缘体-金属转变可以自然地解释为强相关的低自旋态绝缘体（LS状态）和中自旋-低自旋态金属（IS-LS状态） 。特别地，LS状态和IS-LS状态之间的能量差定性地再现了具有纳米片厚度的转变温度的趋势。具有三个嵌段的纳米片的预测转变温度仅略高于室温，这一结果可用于检验我们提出的机理。进一步研究LS状态和IS-LS状态的独特磁输运性质和自旋涨落行为对于解决该问题也非常有帮助。弱的嵌段间结合也与层分辨的部分状态密度一致。

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  • 来源
    《Physical review》 |2017年第3期|035418.1-035418.7|共7页
  • 作者

    Xiaokun Huang; Weiyi Zhang;

  • 作者单位

    National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;

    National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;

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