Applied Physics Letters
Raman spectra and dimensional effect on the charge density wave transition in GdTe₃
Applied Physics Letters · 115, 151905 (2019)
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Introduction
Temperature-dependent Raman spectra and calculations separate phonon modes from charge-density-wave features in GdTe₃. The reported transition rises from 377 K in bulk to 431 K in a film about 10 nm thick.
A closer reading
The rise in ordering temperature challenges a simple expectation that reduced dimensionality always weakens order. Release of chemical pressure is the proposed mechanism. The spectra directly track the transition, not the magnitude of that pressure change.