Temperature-dependent Raman scattering and x-ray diffraction study of phase transitions in layered multiferroic CuCrP2S6
| Autor: | M. V. McLeod, Rahul Rao, Benji Maruyama, Michael A. Susner, A. T. Pelton |
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| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science Physics and Astronomy (miscellaneous) Order (ring theory) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity symbols.namesake Crystallography Negative thermal expansion 0103 physical sciences X-ray crystallography symbols Antiferromagnetism General Materials Science Multiferroics 010306 general physics 0210 nano-technology Raman spectroscopy |
| Zdroj: | Physical Review Materials. 4 |
| ISSN: | 2475-9953 |
| Popis: | Functional van der Waals layered materials, which exhibit interesting phenomena such as magnetism and ferroelectricity, have been proposed for use in next-generation nanoscale devices and sensors. $\mathrm{CuCr}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$ is a promising two-dimensional (2D) material that evinces multiferroic behavior where the $\mathrm{C}{\mathrm{u}}^{+}$ and $\mathrm{C}{\mathrm{r}}^{+3}$ cations are responsible for antiferroelectric and antiferromagnetic ordering, respectively. In this study, we use x-ray diffraction and Raman spectroscopy to map out these phase transitions in the range 70--400 K. The antiferroelectric phase transition is complex and shows a gradual transition to complete antipolar order with an intermediate quasiantipolar step. X-ray diffraction studies reveal evidence for negative thermal expansion across the antipolar phase transitions at \ensuremath{\sim}270 and \ensuremath{\sim}140 K. The latter of these is accompanied by a drastic reduction in rotational and translational mode frequencies of the anion groups in $\mathrm{CuCr}{\mathrm{P}}_{2}{\mathrm{S}}_{6}$. Our temperature-dependent structural data provide an important reference for subsequent research into this promising 2D multiferroic material. |
| Databáze: | OpenAIRE |
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