Observation of momentum-dependent charge density wave gap in a layered antiferromagnet GdTe3

Abstract

Charge density wave (CDW) ordering has been an important topic of study for a long time owing to its connection with other exotic phases such as superconductivity and magnetism. The RTe3 (R = rare-earth elements) family of materials provides a fertile ground to study the dynamics of CDW in van der Waals layered materials, and the presence of magnetism in these materials allows to explore the interplay among CDW and long range magnetic ordering. Here, we have carried out a high-resolution angle-resolved photoemission spectroscopy (ARPES) study of a CDW material GdTe3, which is antiferromagnetic below 12 K, along with thermodynamic, electrical transport, magnetic, and Raman measurements. Our Raman spectroscopy measurements show the presence of CDW amplitude mode at room temperature, which remains prominent when the sample is thinned down to 4-layers by exfoliation. Our ARPES data show a two-fold symmetric Fermi surface with both gapped and ungapped regions indicative of the partial nesting. The gap is momentum dependent, maximum along G-Z and gradually decreases going towards G - M. Our study provides a platform to study the dynamics of CDW and its interaction with other physical orders in two- and three-dimensions.

30 pages, 12 figures, Supplementary Information included

References in corpus (11)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Quantum ESPRESSO toward the exascale
• Fermi surface nesting and the origin of Charge Density Waves in metals
• ARPES Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 for R = Y, La, Ce, Sm, Gd, Tb and Dy
• Pressure dependence of the charge-density-wave and superconducting states in GdTe${}_3$, TbTe${}_3$ and DyTe${}_3$
• Magnetic properties of the charge density wave compounds RTe3, R=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er & Tm
• STM Studies of TbTe3: Evidence for a fully Incommensurate Charge Density Wave
• Axial Higgs Mode Detected by Quantum Pathway Interference in RTe3
• Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy
• Charge density wave-generated Fermi surfaces in NdTe${}_3$

Cited by in corpus (4)

• Atomic-Scale Visualization of a Cascade of Magnetic Orders in the Layered Antiferromagnet $GdT{e}_3$
• Observation of momentum dependent charge density wave gap in EuTe4
• Interplay of Kondo Physics with Incommensurate Charge Density Waves in CeTe${}_3$
• Energetically Favored One-Dimensional Moiré Superstructure in the Pseudo-Square Lattice GdTe3