Local Laser Heating Effect on Raman Spectroscopy of β-Co2(OH)3Br

摘要

Raman (4000-95 cm-1) spectra of the recently identified magnetic geometric frustration material-deformed pyrochlore-structure hydroxyl cobalt bromide β-Co2(OH)3Br polycrystalline sample were measured using 10X and 50X microscopic objectives under different laser powers at room temperature.It is found that the obtained Raman bands at these experimental conditions are slightly different from one another.This phenomenon is caused by the so-called local laser heating effect and can help predict the temperature-dependent spectral behavior of β-Co2(OH)3Br around the room temperature.The Raman spectral experiments down to liquid nitrogen temperature (77 K) confirmed this local laser heating effect.