应变TbTe3中共存电荷密度波相的增强滑移
Enhanced sliding in the coexisting Charge Density Wave phase of strained TbTe3
浏览论文内容
中文总结 AI 辅助
本文通过电流-电压测量研究应变TbTe3中CDWc与CDWa相的滑移动力学，发现共存相中两者均滑移且阈值电流降低，证明CDWa为非公度相，并探讨了钉扎势与公度性。研究为准二维CDW滑移理论提出新问题。
中文摘要 AI 辅助
近年来，机械拉伸应力的应用已被证明能在量子材料中触发非常规相。最近，有报道称在中等单轴拉伸应力下，TbTe3的电荷密度波（CDW）发生了取向转变，这与面内a/c晶格各向异性有关。这导致原始的c取向CDW（CDWc）消失，并出现正交的a取向CDW（CDWa）。当a=c时，出现CDWa和CDWc叠加的共存相。在此，我们通过测量电流-电压特性及相应的微分电阻，探究了CDWc和CDWa在施加拉伸应力下（即纯CDWc、纯CDWa和共存相中）的滑移动力学。虽然原始CDWc多年来已知表现出非线性动力学并因此发生滑移，但我们在此证明，应变诱导的CDWa相也表现出相同的特性，证明其非公度性质。此外，我们表明在共存相中，CDWc和CDWa均发生滑移，且阈值电流降低，这对这些共存正交CDW在实空间中的微观结构提出了疑问。最后，所有形变状态下阈值场的线性关系得以保持，且在Tc处存在有限阈值场，这从公度性和钉扎势的角度进行了讨论。这项工作为准二维系统中滑移CDW的理论描述提出了新的问题。
英文摘要
In the last years, the application of mechanical tensile stress has been shown to trigger unconventional phases in quantum materials. Recently, an orientational transition of the charge density wave (CDW) of TbTe3 was reported under the application of moderate uniaxial tensile stress, associated to the in-plane a/c lattice anisotropy. This leads to the disappearance of the pristine c-oriented CDW (CDWc) and to the appearance of the orthogonal a-oriented one (CDWa). A coexistence phase with a superposition of CDWa and CDWc appears when a=c. Here, we probe the sliding dynamics of both CDWc and CDWa as a function of applied tensile stress, i.e. in the pure CDWc, pure CDWa and coexistence phases, by measuring current-voltage characteristics and associated differential resistances. If the pristine CDWc has been known to display non-linear dynamics and thus sliding for several years, we show here that the strain-induced CDWa phase also displays the same characteristics, proving its incommensurate nature. Moreover, we show that sliding also takes place both for CDWc and CDWa, with reduced threshold currents, in the coexistence phase, which questions the microstructure of these coexisting orthogonal CDWs in real space. Finally, the linearity of the threshold fields is kept for all deformation states, with finite threshold fields at Tc, which is discussed in terms of commensurability and pinning potentials. This work opens new questions for the theoretical description of sliding CDWs in quasi-2D systems.
发表机构
- Université Paris-Saclay（巴黎萨克雷大学）
- CNRS（法国国家科学研究中心）
- Kotelnikov Institute of Radioengineering and Electronics of RAS（俄罗斯科学院科捷尔尼科夫无线电电子学研究所）
- Univ. Grenoble Alpes（格勒诺布尔阿尔卑斯大学）
- Grenoble INP（格勒诺布尔理工学院）
- Institut Néel（奈尔研究所）
机构由 AI 辅助整理，请以论文原文为准。
