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| Journal Article | PUBDB-2025-04494 |
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2025
American Inst. of Physics
Melville, NY
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Please use a persistent id in citations: doi:10.1063/5.0273331 doi:10.3204/PUBDB-2025-04494
Abstract: We report high-pressure x-ray diffraction, Raman scattering, photoluminescence, and absorption measurements on vacancy-ordered halide double perovskite Cs$_2$TeBr$_6$. An electronic transition becomes apparent at around 2.3 GPa, characterized by anomalous behavior in the normalized pressure as a function of the Eulerian strain, a broad minimum in Raman linewidth, and a slope change in the linear pressure variation of a Raman mode frequency. The large compressibility and the observed anomalies in Raman scattering suggest that the material is soft and exhibits a strong electron–phonon coupling. The broad emission below the bandgap is attributed to the recombination of self-trapped excitons. The crystal, consisting of undistorted octahedra, exhibits substantial emission enhancement and bandgap narrowing under pressure. The electronic transition is further supported by the observed emission maximum and a small kink in the pressure variation of the bandgap at around 2.3 GPa.
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