Abstract:

RTe3 (R=La-Nd, Sm, Gd-Tm, Y) is a layered material that displays in-plane, unidirectional charge density wave (CDW) order on a nominally square lattice. Transport measurements and recent XRD measurements performed at the APS reveal the ability of anisotropic strains to rotate the primary CDW wavevector in the material. While it has been confirmed that this strain induced CDW state is achievable, little is still known however about the character of this state. Inelastic x-ray spectroscopy measurements allow us to investigate the lattice dynamical properties of the rotated CDW phase transition in RTe3. In this talk, we will discuss the technical challenges of in-situ strain tuning for phonon spectroscopy measurements as well as preliminary data of the evolution of the soft mode associated with the CDW phase when the system is strained. This study of the reorientation of the CDW will expand our understanding of the ability of uniaxial strain to restore the rotational symmetry of the system establishing RTe3 as a model material to investigate nematic order arising from CDW fluctuations. Ultimately these strain-based phonon spectroscopy measurements may provide additional insight into the nature of the CDW phase in RTe3 and more broadly into the origin and behavior of CDW states in 2D materials.

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