Orientation Controlled Anisotropy in Single Crystals of Quasi-1D BaTiS3

Abstract

Low-dimensional materials with chain-like (one-dimensional) or layered (twodimensional) structures are of significant interest due to their anisotropic electrical, optical, thermal properties. One material with 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 (aand c-axis orientations) were grown by chemical vapor transport. X-ray absorption spectroscopy (XAS) was used to characterize the local structure and electronic anisotropy of BTS. Fourier transform infrared (FTIR) reflection/transmission spectra show a large inplane 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 IR 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.

References in corpus (9)

• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
• Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials
• Orbital reconstruction and two-dimensional electron gas at the LaAlO3/SrTiO3 interface
• Anisotropic Thermal Conductivity of Exfoliated Black Phosphorus
• Electronics and optoelectronics of quasi-one dimensional layered transition metal trichalcogenides
• Anisotropic thermal transport in bulk hexagonal boron nitride
• Dislocation-induced thermal transport anisotropy in single-crystal group-III nitride films
• Temperature dependence of anisotropic thermal conductivity tensor of bulk black phosphorus

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