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Interplay between multiple charge-density waves and the relationship with superconductivity in Pd_xHoTe_3

机译:Pd_xHoTe_3中多个电荷密度波之间的相互作用以及与超导的关系

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摘要

HoTe_3, a member of the rare-earth tritelluride (RTe_3) family, and its Pd-intercalated compounds, Pd_xHoTe_3, where superconductivity (SC) sets in as the charge-density wave (CDW) transition is suppressed by the intercalation of a small amount of Pd, are investigated using angle-resolved photoemission spectroscopy (ARPES) and electrical resistivity. Two incommensurate CDWs with perpendicular nesting vectors are observed in HoTe_3 at low temperatures. With a slight Pd intercalation (x = 0.01), the large CDW gap decreases and the small one increases. The momentum dependence of the gaps along the inner Fermi surface (FS) evolves from orthorhombicity to near tetragonality, manifesting the competition between two CDW orders. At x = 0.02, both CDW gaps decrease with the emergence of SC. Further increasing the content of Pd for x = 0.04 will completely suppress the CDW instabilities and give rise to the maximal SC order. The evolution of the electronic structures and electron-phonon couplings (EPCs) of the multiple CDWs upon Pd intercalation are carefully scrutinized. We discuss the interplay between multiple CDW orders, and the competition between CDW and SC in detail.
机译:HoTe_3(稀土三碲化物(RTe_3)家族的成员)及其Pd嵌入的化合物Pd_xHoTe_3,其中的超导电性(SC)作为电荷密度波(CDW)的转变被少量的嵌入抑制使用角度分辨光发射光谱(ARPES)和电阻率研究了钯的含量。在低温下,在HoTe_3中观察到两个带有垂直嵌套矢量的不相称的CDW。 Pd插入量很小(x = 0.01),较大的CDW间隙减小,较小的CDW间隙增大。沿内费米表面(FS)的间隙的动量依赖性从正交性发展到接近四方性,表现出两个CDW阶之间的竞争。在x = 0.02时,两个CDW间隙都随着SC的出现而减小。当x = 0.04时进一步增加Pd的含量将完全抑制CDW的不稳定性,并产生最大的SC级数。仔细检查了钯嵌入后,多个CDW的电子结构和电子-声子耦合(EPC)的演变。我们详细讨论了多个CDW订单之间的相互作用,以及CDW和SC之间的竞争。

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  • 来源
    《Physical review》 |2016年第11期|115133.1-115133.6|共6页
  • 作者单位

    Department of Physics, Renmin University of China, Beijing 100872, China,Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China;

    Department of Physics, Renmin University of China, Beijing 100872, China,Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China,Department of Physics, McMaster University, Hamilton, Ontario, Canada L8S 4M1;

    Institute for Solid State Research, IFW Dresden, Dresden 01171, Germany,State Key Laboratory of Functional Materials for Informatic, SIMIT, Chinese Academy of Sciences, Shanghai 200050, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    Department of Physics, Renmin University of China, Beijing 100872, China,Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China;

    Department of Physics, Renmin University of China, Beijing 100872, China,Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China;

    Department of Physics, Renmin University of China, Beijing 100872, China,Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Physics and Electronic Engineering College, Nanyang Normal University, Nanyang 473061, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing, China;

    Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing, China;

    Department of Physics, Renmin University of China, Beijing 100872, China,Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing, China;

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