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Giant thermal Hall conductivity in the pseudogap phase of cuprate superconductors

机译：铜酸盐超导体假间隙相中的巨大热霍尔电导率

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摘要

The nature of the pseudogap phase of the copper oxides ('cuprates') remains a puzzle. Although there are indications that this phase breaks various symmetries, there is no consensus on its fundamental nature(1). Fermi-surface, transport and thermodynamic signatures of the pseudogap phase are reminiscent of a transition into a phase with antiferromagnetic order, but evidence for an associated long-range magnetic order is still lacking(2). Here we report measurements of the thermal Hall conductivity (in the x-y plane, kappa(xy)) in the normal state of four different cuprates-La1.6-xNd0.4SrxCuO4, La1.8-xEu0.2SrxCuO4, La2-xSrxCuO4 and Bi2Sr2-xLaxCuO6+delta. We show that a large negative kappa(xy) signal is a property of the pseudogap phase, appearing at its critical hole doping, p*. It is also a property of the Mott insulator at p approximate to 0, where kappa(xy) has the largest reported magnitude of any insulator so far(3). Because this negative kappa(xy) signal grows as the system becomes increasingly insulating electrically, it cannot be attributed to conventional mobile charge carriers. Nor is it due to magnons, because it exists in the absence of magnetic order. Our observation is reminiscent of the thermal Hall conductivity of insulators with spin-liquid states(4-6), pointing to neutral excitations with spin chirality(7) in the pseudogap phase of cuprates.
机译：氧化铜的假间隙相（“铜酸盐”）的性质仍然令人困惑。尽管有迹象表明该阶段会破坏各种对称性，但对其基本性质尚无共识（1）。伪间隙相的费米表面，输运和热力学特征让人想起向反铁磁序相的转变，但仍缺乏相关的远距离磁序的证据（2）。在这里，我们报告了四种不同的铜酸盐-La1.6-xNd0.4SrxCuO4，La1.8-xEu0.2SrxCuO4，La2-xSrxCuO4和Bi2Sr2在正常状态下的霍尔热传导率的测量值（在xy平面上，kappa（xy））。 -xLaxCuO6 + delta。我们表明，较大的负kappa（xy）信号是伪间隙相位的一个属性，出现在其临界空穴掺杂p *处。这也是Mott绝缘子在p接近0时的一个特性，其中kappa（xy）迄今为止是所有绝缘子中报告的最大量级（3）。由于该负kappa（xy）信号随着系统变得越来越电绝缘而增长，因此不能归因于常规移动电荷载体。它也不是由于磁振子造成的，因为它在没有磁阶的情况下存在。我们的观察使人想起了具有自旋液体状态的绝缘子的热霍尔电导率（4-6），指出了在铜酸盐的伪间隙相中具有自旋手性的中性激发（7）。

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  • 来源
    《Nature》 |2019年第7765期|376-380|共5页
  • 作者

    Grissonnanche G.; Legros A.; Badoux S.; Lefrancois E.; Zatko V.; Lizaire M.; Laliberte F.; Gourgout A.; Zhou J. -S.; Pyon S.; Takayama T.; Takagi H.; Ono S.; Doiron-Leyraud N.; Taillefer L.;

  • 作者单位

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada|Univ Paris Saclay, CNRS UMR3680, SPEC, CEA, Gif Sur Yvette, France;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Texas Austin, Dept Mech Engn, Mat Sci & Engn Program, Austin, TX 78712 USA;

    Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba, Japan|Univ Tokyo, Dept Appl Phys, Tokyo, Japan;

    Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba, Japan|Max Planck Inst Solid State Res, Stuttgart, Germany;

    Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba, Japan|Max Planck Inst Solid State Res, Stuttgart, Germany|Univ Tokyo, Dept Phys, Tokyo, Japan|Univ Stuttgart, Inst Funct Matter & Quantum Technol, Stuttgart, Germany;

    Cent Res Inst Elect Power Ind, Yokosuka, Kanagawa, Japan;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada;

    Univ Sherbrooke, Dept Phys, Inst Quant, Sherbrooke, PQ, Canada|Univ Sherbrooke, RQMP, Sherbrooke, PQ, Canada|Canadian Inst Adv Res, Toronto, ON, Canada;

  • 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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