دورية أكاديمية
Dielectric function and interband critical points of compressively strained ferroelectric K
| العنوان: | Dielectric function and interband critical points of compressively strained ferroelectric K |
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| المؤلفون: | Bin Anooz, Saud, Petrik, Peter, Wang, Yankun, Mukherjee, Deshabrato, Schmidbauer, Martin, Schwarzkopf, Jutta |
| المصدر: | Opt Express ; ISSN:1094-4087 ; Volume:32 ; Issue:9 |
| بيانات النشر: | Optica Publishing Group |
| سنة النشر: | 2024 |
| المجموعة: | PubMed Central (PMC) |
| الوصف: | The dielectric function and interband critical points of compressively strained ferroelectric K0.85Na0.15NbO3 thin film grown by metal-organic vapor phase epitaxy (MOVPE) are studied in broad spectral and temperature ranges by spectroscopic ellipsometry (SE). The temperature dependence of the measured pseudodielectric functions is strongly affected by a structural phase transition from the monoclinic Mc-phase to the orthorhombic c-phase at about 428 K. Using a parametric optical constant model, the corresponding dielectric functions as well as the interband optical transitions of the film are determined in the spectral range of 0.73-6.00 eV. Standard critical point (SCP) analysis of the 2nd derivatives of the dielectric functions identified three and four critical points for monoclinic and orthorhombic symmetries, respectively. A systematic redshift of the threshold energies with increasing temperatures was observed. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://doi.org/10.1364/OE.520426Test; https://pubmed.ncbi.nlm.nih.gov/38859207Test |
| DOI: | 10.1364/OE.520426 |
| الإتاحة: | https://doi.org/10.1364/OE.520426Test https://pubmed.ncbi.nlm.nih.gov/38859207Test |
| رقم الانضمام: | edsbas.382A27DA |
| قاعدة البيانات: | BASE |
| DOI: | 10.1364/OE.520426 |
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