English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present temperature dependent frequency shift and line broadening ofphonon modes by insertion of atomic layers of Pb and PbTe in the prototype 3Dtopological insulator Bi2Te3, using Raman spectroscopy. Good quality singlecrystals of Pb2Bi2Te3, PbBi2Te4 and PbBi4Te7 are grown using the modifiedBridgman technique. The Raman modes show progressive blue shift with thedecrease in temperature from 298 K to 93 K in Pb2Bi2Te3, PbBi2Te4 and PbBi4Te7is due to anharmonic vibrations of the lattice as well as increasing strengthof Bi-Te covalent interactions. Experimental results are complemented byextensive density functional theory calculations where a reasonable matchingbetween experimental and computational data is found. Chemical pressure,induces by the insertion of Pb and PbTe layers in Bi2Te3, modifies theinteractions at the boundaries of the quintuple-layers which is evident fromthe evolution of mode. The enhancement of out-of-plane Bi-Te vibrations withrespect to in-plane Bi-Te vibrations are observed at low temperatures.

physical chemistry chemical physics/pccp. physical chemistry chemical physics

Vibrational Spectra of Pb2Bi2Te3, PbBi2Te4 and PbBi4Te7 Topological  Insulators: Temperature Dependent Raman and Theoretical Insight from DFT  Simulations