| Summary: | The charge density wave (CDW) state is a widespread phenomenon in
low-dimensional metals/semimetals. The spectral weight of the associated folded bands (shadow bands) can be an intriguing trigger leading to additional Fermi surface instability and unexplored phase transitions. The rare earth
tri-telluride CeTe3 exhibits a single CDW stabilized below ~400 K and
antiferromagnetism below ~3 K. The distinct periodicities between the Te-square net, the CeTe block layer, and the CDW give rise to rich shadow band
formations. In this work, we reveal the predominant scattering between the
original and shadow bands at 4 K, with the scattering within the original bands
being relatively suppressed at Fermi energy. This unconventional quasi-particle scattering collectively underscores the vital role of the shadow bands'
spectral weight and the hidden matrix element effect, which are crucial for
controlling electronic properties in this system. Furthermore, our finding
points to the existence of rich and unexplored Fermi surface instabilities,
which potentially play a role in controlling the nature of long-range
antiferromagnetism at lower temperatures in the presence of finite charge-spin
interaction.
|
|---|