Chalcogenide perovskites have emerged as a new class of electronic materials, but fundamental properties and applications of chalcogenide perovskites remain limited by the lack of high quality epitaxial thin films. We report epitaxial thin film growth of BaZrS3, a prototypical chalcogenide,
Low-dimensional materials with chain-like
(one-dimensional) or
layered (two-dimensional) structures are of significant interest due
to their anisotropic electrical, optical, and thermal properties.
One material with a chain-like structure, BaTiS3 (BTS),
was recently shown to possess giant in-plane optical anisotropy and
glass-like thermal conductivity. To understand the origin of these
effects, it is necessary to fully characterize the optical, thermal,
and electronic anisotropy of BTS. To this end, BTS crystals with different
orientations (a- and c-axis orientations)
were grown by chemical vapor transport. X-ray absorption spectroscopy
was used to characterize the local structure and electronic anisotropy
of BTS. Fourier transform infrared reflection/transmission spectra
show a large in-plane optical anisotropy in the a-oriented crystals, while the c-axis oriented crystals
were nearly isotropic in-plane. BTS platelet crystals are promising
uniaxial materials for infrared optics with their optic axis parallel
to the c-axis. The thermal conductivity measurements
revealed a thermal anisotropy of ∼4.5 between the c- and a-axis. Time-domain Brillouin scattering showed
that the longitudinal sound speed along the two axes is nearly the
same, suggesting that the thermal anisotropy is a result of different
phonon scattering rates.
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