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Influence of Ti doping on the incommensurate charge density wave in 1T-TaS_2

机译:钛掺杂对1T-TaS_2中不相称的电荷密度波的影响

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摘要

We report temperature-dependent transport and x-ray diffraction measurements of the influence of Ti hole doping on the charge density wave (CDW) in 1T-Ta_(1-x)Ti_xS_2. Confirming past studies, we find that even trace impurities eliminate the low-temperature commensurate (C) phase in this system. Surprisingly, the magnitude of the in-plane component of the CDW wave vector in the nearly commensurate (NC) phase does not change significantly with Ti concentration, as might be expected from a changing Fermi surface volume. Instead, the angle of the CDW in the basal plane rotates, from 11.9° at x = 0 to 16.4° at x = 0.12. Ti substitution also leads to an extended region of coexistence between incommensurate (IC) and NC phases, indicating heterogeneous nucleation near the transition. Finally, we explain a resistive anomaly originally observed by Di Salvo [F. J. Di Salvo et al., Phys. Rev. B 12, 2220 (1975)] as arising from pinning of the CDW on the crystal lattice. Our study highlights the importance of commensuration effects in the NC phase, particularly at x ~ 0.08.
机译:我们报告了1T-Ta_(1-x)Ti_xS_2中Ti空穴掺杂对电荷密度波(CDW)的影响的温度依赖性传输和x射线衍射测量。证实过去的研究,我们发现即使微量的杂质也可以消除该系统中的低温相称(C)相。出人意料的是,CDW波矢量的面内分量在相称(NC)相中的幅度不会随Ti浓度而显着改变,这可能是由于费米表面体积的变化所预期的。取而代之的是,CDW在基面上的角度从x = 0时的11.9°旋转到x = 0.12时的16.4°。 Ti取代还导致不相称(IC)和NC相之间的共存区域扩大,表明过渡附近存在异相形核。最后,我们解释了Di Salvo最初观察到的电阻异常[F. J.Di Salvo等人,Phys。 Rev. B 12,2220(1975)]是由于CDW钉在晶格上而引起的。我们的研究强调了NC阶段,尤其是在x〜0.08时,相称效应的重要性。

著录项

  • 来源
    《Physical review》 |2015年第24期|245113.1-245113.6|共6页
  • 作者单位

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA;

    Synchrotron Studies of Quantum Matter, Leibniz Institute for Solid State and Materials Research, Dresden, Germany;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

    Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 104 South Goodwin Avenue, Urbana, Illinois 61801, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    charge-density-wave systems;

    机译:电荷密度波系统;

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