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Unconventional orbital ordering and emergent dimensional reduction in fulleride superconductors

机译：富勒德超导体的非传统轨道排序和紧急尺寸减少

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摘要

Nonlocal order parameters in space-time are proposed to characterize the unconventional orbital-selective conducting state in fulleride superconductors, called the Jahn-Teller metal. In previous works, it has been argued that this state can be interpreted as a spontaneous orbital-selectiveMott state, in which the electrons in two of the three t(1u) molecular orbitals are localized, while those in the third one are metallic. Here, based on the realistic band structure for fullerides, we provide a systematic study of nonlocal order parameters and characterize the Jahn-Teller metal, for which there exists no one-body local order parameter in contrast to conventional orderings. It is shown that the Mottness, or integer filling nature for each orbital due to strong correlation effects, is a relevant feature of the present orbital order. The local orbital moment thus vanishes and the static distortion associated with a conventional orbital moment is absent. Transport characteristics are also investigated, and it is found that the dimensionality is effectively reduced from three to two at low energies, while the cubic nature is recovered at high energies. This accounts for the high upper critical field observed in the superconducting state of the fcc fullerides inside the Jahn-Teller metal regime.
机译：建议在空间时间中的非函数顺序参数在富勒佩德超导体中表征了富勒德超导体的非传统轨道选择性导电状态，称为Jahn-Teller金属。在以前的作用中，已经认为这种状态可以被解释为自发的轨道 - 选择性状态，其中三个T（1U）分子轨道中的两种电子是局部的，而第三个是金属的电子。这里，基于富勒德的现实频带结构，我们提供了对非局部阶参数的系统研究，并表征了Jahn-Teller金属，与传统排序相比，没有一个人体本地顺序参数。结果表明，由于相关效应强，每个轨道的掩模或整数填充性是目前轨道顺序的相关特征。如此消失的局部轨道片段和与传统轨道片相关联的静态变形是不存在的。还研究了运输特性，发现维度在低能量下从三到两个有效地减少了维度，而立方性质在高能量下恢复。这对Jahn-Teller金属制度内的FCC富勒斯超导状态观察到的高上临界领域。

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  • 来源
    《Physical review》 |2019年第23期|235133.1-235133.11|共11页
  • 作者

    Hoshino Shintaro; Werner Philipp; Arita Ryotaro;

  • 作者单位

    Saitama Univ Dept Phys Shimo Okubo Saitama 3388570 Japan;

    Univ Fribourg Dept Phys CH-1700 Fribourg Switzerland;

    Univ Tokyo Dept Appl Phys Hongo Tokyo 1138656 Japan|RIKEN Ctr Emergent Matter Sci Wako Saitama 3510198 Japan|JST Isobe Degenerate Integrat Project ERATO Hongo Tokyo 1130033 Japan;

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