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Size effects on thermoelectricity in a strongly correlated oxide

机译:尺寸对强相关氧化物中热电的影响

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摘要

We investigated size effects on thermoelectricity in thin films of a strongly correlated layered cobaltate. At room temperature, the thermopower is independent of thickness down to 6 nm. This unusual behavior is inconsistent with the Fuchs-Sondheimer theory, which is used to describe conventional metals and semiconductors, and is attributed to the strong electron correlations in this material. On the other hand, the resistivity increases below a critical thickness of ~30 nm, as expected. The temperature-dependent thermopower is similar for different thicknesses but the resistivity shows systematic changes with thickness. Our experiments highlight the differences in thermoelectric behavior of strongly correlated and uncorrelated systems when subjected to finite-size effects. We use the atomic-limit Hubbard model at the high-temperature limit to explain our observations. These findings provide new insights into decoupling electrical conductivity and thermopower in correlated systems.
机译:我们研究了强相关的层状钴酸盐薄膜对热电大小的影响。在室温下,热功率与厚度低至6 nm的厚度无关。这种不寻常的行为与用于描述常规金属和半导体的Fuchs-Sondheimer理论不一致,并且归因于这种材料中的强电子相关性。另一方面,正如预期的那样,电阻率在〜30 nm的临界厚度以下增加。不同厚度的温度相关的热功率相似,但电阻率随厚度显示出系统的变化。我们的实验突出显示了当受到有限大小的影响时,强相关和不相关系统在热电行为方面的差异。我们使用高温极限下的原子极限哈伯德模型来解释我们的观察结果。这些发现为相关系统中电导率和热功率的解耦提供了新的见解。

著录项

  • 来源
    《Physical review》 |2012年第8期|p.085112.1-085112.5|共5页
  • 作者单位

    Applied Science and Technology Graduate Group, University of California, Berkeley, Berkeley, California 94720, USA,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;

    Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA,Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA;

    Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA;

    ARPA-E, US Department of Energy, 1000 Independence Avenue, Washington, DC 20585, USA;

    Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA,Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, USA,Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA,SETP, US Department of Energy, 1000 Independence Avenue, Washington, DC 20585, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    thermoelectric effects; strongly correlated electron systems; heavy fermions;

    机译:热电效应强相关电子系统;重费米子;

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