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Compensated electron and hole pockets in an underdoped high-T_c superconductor

机译：掺杂不足的高T_c超导体中的补偿电子和空穴穴

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摘要

We report quantum oscillations in the underdoped high-temperature superconductor YBa_2Cu_3O_(6+x) over a wide range in magnetic field 28≤μ_0H≤85 T corresponding to =12 oscillations, enabling the Fermi surface topology to be mapped to high resolution. As earlier reported by Sebastian et al. [Nature (London) 454, 200 (2008)], we find a Fermi surface comprising multiple pockets, as revealed by the additional distinct quantum oscillation frequencies and harmonics reported in this work. We find the originally reported broad low-frequency Fourier peak at ≈535 T to be clearly resolved into three separate peaks at ≈460, ≈532, and ≈602 T, in reasonable agreement with the reported frequencies of Audouard et al. [Phys. Rev. Lett. 103, 157003 (2009)]. However, our increased resolution and angle-resolved measurements identify these frequencies to originate from two similarly sized pockets with greatly contrasting degrees of interlayer corrugation. The spectrally dominant frequency originates from a pocket (denoted α) that is almost ideally two-dimensional in form (exhibiting negligible interlayer corrugation). In contrast, the newly resolved weaker adjacent spectral features originate from a deeply corrugated pocket (denoted γ). On comparison with band structure, the d-wave symmtry of the interlayer dispersion locates the minimally corrugated α pocket at the "nodal" point k_(nodal) = (π/2,π/2), and the significantly corrugated γ pocket at the "antinodal" point k_(antinodal)=(π,0) within the Brillouin zone. The differently corrugated pockets at different locations indicate creation by translational symmetry breaking-a spin-density wave has been suggested from the suppression of Zeeman splitting for the spectrally dominant pocket. In a broken-translational symmetry scenario, symmetry points to the nodal (α) pocket corresponding to holes, with the weaker antinodal (γ) pocket corresponding to electrons-likely responsible for the negative Hall coefficient reported by LeBoeuf et al. [Nature (London) 450, 533 (2007)]. Given the similarity in α and γ pocket volumes, their opposite carrier type and the previous report of a diverging effective mass in Sebastian et al. [Proc. Nat. Am. Soc. 107, 6175 (2010)], we discuss the possibility of a secondary Fermi surface instability at low dopings of the excitonic insulator type, associated with the metal-insulator quantum critical point. Its potential involvement in the enhancement of superconducting transition temperatures is also discussed.
机译：我们报告了在磁场掺杂范围28≤μ_0H≤85T的情况下，欠掺杂的高温超导体YBa_2Cu_3O_（6 + x）在宽范围内的量子振荡，对应于= 12振荡，从而使费米表面拓扑可以映射为高分辨率。正如Sebastian等人先前所报道。 [Nature（London）454，200（2008）]，我们发现包含多个凹穴的费米表面，如这项工作中报道的其他独特的量子振荡频率和谐波所揭示。我们发现，最初报告的约535 T处的低频低频傅立叶峰可以清晰地分解为约460≈，≈532Ω和≈602 T的三个单独的峰，与Audouard等人的报告频率有合理的一致性。 [物理牧师103，157003（2009）]。但是，我们提高的分辨率和角度分辨的测量值将这些频率确定为源自两个大小相似的袋，并且层间波纹度的对比度明显不同。频谱主导频率来自一个袋（表示为α），该袋几乎是理想的二维形式（层间波纹可忽略不计）。相反，新近分辨出的较弱的相邻光谱特征源自深波纹袋（表示为γ）。与能带结构相比，层间色散的d波对称性将最小波纹的α袋位于“节点”点k_（节点）=（π/ 2，π/ 2），而明显的波纹γ袋位于容器的“节点”点。布里渊区中的“蚁”点k_（蚁）=（π，0）。在不同位置出现的不同波纹状凹坑表明通过平移对称性破坏产生了-自旋塞波密度波已被认为是通过抑制频谱占优势的凹坑的塞曼分裂而产生的。在断裂平移对称的情况下，对称指向对应于空穴的节点（α）凹穴，而较弱的对应于电子的反节点（γ）凹穴则可能是LeBoeuf等人报道的负霍尔系数。 [Nature（London）450，533（2007）。鉴于α和γ囊袋体积的相似性，它们的相反载流子类型以及Sebastian等人先前关于有效质量发散的报道。 [过程纳特上午。 Soc。 107，6175（2010）]，我们讨论了在低掺杂的激子绝缘子类型下，与金属绝缘子量子临界点相关的二次费米表面不稳定性的可能性。还讨论了其在提高超导转变温度中的潜在作用。

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  • 来源
    《Physical review》 |2010年第21期|P.214524.1-214524.17|共17页
  • 作者

    Suchitra E. Sebastian; N. Harrison; P. A. Goddard; M. M. Altarawneh; C. H. Mielke; Ruixing Liang; D. A. Bonn; W. N. Hardy; O. K. Andersen; G. G. Lonzarich;

  • 作者单位

    Cavendish Laboratory, Cambridge University, J. J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom;

    rnLos Alamos National Laboratory, LANL, Los Alamos, New Mexico 87545, USA;

    rnClarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom;

    rnLos Alamos National Laboratory, LANL, Los Alamos, New Mexico 87545, USA;

    rnLos Alamos National Laboratory, LANL, Los Alamos, New Mexico 87545, USA;

    rnDepartment of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z4 Canadian Institute for Advanced Research, Toronto, Canada M5G 1Z8;

    rnDepartment of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z4 Canadian Institute for Advanced Research, Toronto, Canada M5G 1Z8;

    rnDepartment of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T 1Z4 Canadian Institute for Advanced Research, Toronto, Canada M5G 1Z8;

    rnMax-Planck-Institut fuer Feskoerperforschung, Stuttgart, Germany;

    rnCavendish Laboratory, Cambridge University, J. J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom;

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  • 关键词

    electronic structure; cuprate superconductors (high-Tc and insulating parent compounds); fermi surface: calculations and measurements; effective mass, G factor; excitons and related phenomena;

    机译：电子结构铜酸盐超导体（高Tc和绝缘母体化合物）;费米表面：计算和测量;有效质量;G因子;激子及相关现象;

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