Effects of temperature and electric field on order parameters in ferroelectric hexagonal manganites
| Autor: | P. Jia, Kexin Yang, Jun-Ming Liu, H. L. Lin, Chun-zao Li, Caorong Zhang, Lin Lin, Zhendong Yan |
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| Rok vydání: | 2018 |
| Předmět: |
Work (thermodynamics)
Phase transition Materials science Condensed matter physics General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity Amplitude Electric field Phase (matter) 0103 physical sciences Polar 010306 general physics 0210 nano-technology Critical exponent |
| Zdroj: | Journal of Applied Physics. 123:094102 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.5010063 |
| Popis: | In Landau-Devonshire phase transition theory, the order parameter represents a unique property for a disorder-order transition at the critical temperature. Nevertheless, for a phase transition with more than one order parameter, such behaviors can be quite different and system-dependent in many cases. In this work, we investigate the temperature (T) and electric field (E) dependence of the two order parameters in improper ferroelectric hexagonal manganites, addressing the phase transition from the high-symmetry P63/mmc structure to the polar P63cm structure. It is revealed that the trimerization as the primary order parameter with two components: the trimerization amplitude Q and phase Φ, and the spontaneous polarization P emerging as the secondary order parameter exhibit quite different stability behaviors against various T and E. The critical exponents for the two parameters Q and P are 1/2 and 3/2, respectively. As temperature increases, the window for the electric field E enduring the trimerization st... |
| Databáze: | OpenAIRE |
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