Structural, Raman Spectroscopy and Photoluminescence Study of the Heaviest Rare Earth Metal Based Titanate
2019
LuTiO₃ is a rare earth metal based perovskite. Generally rare earth metals
have +3 oxidation state. Extreme temperature and pressure condition study
on this perovskite was intended to be done. Firstly the perovskite was synthesized
with a very special new technique Laser quenching method. It appears to
be a very interesting perovskite. Interestingly not much of a study on this perovskite
have been found in so far research articles. Low temperature (3K) Raman
spectroscopic study have been done on this sample and subsequent photoluminescence
study showed surprising behaviour. From temperature dependent
Raman study no phase transition or new Raman mode appearance was found,
which suggest not much of a structural change has been occurred. Whereas
temperature dependent photoluminescence study showed remarkably strange
behaviour. Around 180K a bunch of new peak started to arise. The explanation
of this might be different orbital coupling or effect from the defect in the unit
cell. To confirm this further study is needed to be done. It might be spin-orbital
coupling as well. It showed phonon-phonon and phonon-spin wave coupling
below 50 K and 150 K respectively.
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