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Electronic in-plane symmetry breaking at field-tuned quantum criticality in CeRhIn5

机译：CeRhIn5中的电子平面对称性打破了场调节量子临界

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摘要

Electronic nematic materials are characterized by a lowered symmetry of the electronic system compared to the underlying lattice, in analogy to the directional alignment without translational order in nematic liquid crystals(1). Such nematic phases appear in the copper-and iron-based high-temperature superconductors(2-4), and their role in establishing superconductivity remains an open question. Nematicity may take an active part, cooperating or competing with superconductivity, or may appear accidentally in such systems. Here we present experimental evidence for a phase of fluctuating nematic character in a heavy-fermion superconductor, CeRhIn5 (ref. 5). We observe a magnetic-field-induced state in the vicinity of a field-tuned antiferromagnetic quantum critical point at H-c approximate to 50 tesla. This phase appears above an out-of-plane critical field H* approximate to 28 tesla and is characterized by a substantial in-plane resistivity anisotropy in the presence of a small in-plane field component. The in-plane symmetry breaking has little apparent connection to the underlying lattice, as evidenced by the small magnitude of the magnetostriction anomaly at H*. Furthermore, no anomalies appear in the magnetic torque, suggesting the absence of metamagnetism in this field range. The appearance of nematic behaviour in a prototypical heavy-fermion superconductor highlights the interrelation of nematicity and unconventional superconductivity, suggesting nematicity to be common among correlated materials.
机译：与向列液晶相比，电子向列材料的特征是与下层晶格相比，电子系统的对称性降低，类似于向列液晶中没有平移顺序的定向排列（1）。这种向列相出现在铜和铁基高温超导体中（2-4），它们在建立超导性中的作用仍然是一个悬而未决的问题。向列性可能会发挥积极作用，与超导合作或竞争，或者可能偶然出现在此类系统中。在这里，我们提供了重费米子超导体CeRhIn5（参考文献5）中向列相特征波动的实验证据。我们在H-c处大约50特斯拉的场调谐反铁磁量子临界点附近观察到磁场感应的状态。该相出现在接近28特斯拉的平面外临界场H *上方，其特征在于在存在较小的平面内场分量的情况下，平面内电阻率各向异性大。平面内对称破坏与下面的晶格几乎没有明显的联系，如H *处磁致伸缩异常的小幅度所证明的。此外，在磁转矩中没有出现异常，表明在该磁场范围内不存在超磁性。在典型的重费米子超导体中向列行为的出现突出了向列性和非常规超导性之间的相互关系，表明向列性在相关材料中很常见。

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  • 来源
    《Nature》 |2017年第7667期|313-317|共5页
  • 作者

    Ronning F.; Helm T.; Hirer K. R. S.; Bachmann M. D.; Balicas L.; Chan M. K.; Ramshaw B. J.; McDonald R. D.; Balakirev F. F.; Jaime M.; Bauer E. D.; Moll P. J. W.;

  • 作者单位

    Los Alamos Natl Lab, Los Alamos, NM 87545 USA;

    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany;

    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany;

    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany;

    Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA;

    LANL, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA;

    LANL, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA|Cornell Univ, Lab Atom & Solid State Phys, 142 Sci Dr, Ithaca, NY 14853 USA;

    LANL, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA;

    LANL, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA;

    LANL, Natl High Magnet Field Lab, MS E536, Los Alamos, NM 87545 USA|Inst Mat Sci Agh, Los Alamos, NM 87545 USA;

    Los Alamos Natl Lab, Los Alamos, NM 87545 USA;

    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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