Speaker
Lakshmi Sajeev
(Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno)
Description
Pb$_{1-x}$Ge$_x$Te and Pb$_{1-x}$Sn$_x$Te are novel pseudo-binary alloys that are widely studied for their reversible ferroelectric phase transition between cubic O$_h$ and rhombohedral C$_{3v}$ structures at temperatures above and below the phase transition, accompanied by anomalies in properties like resistivity and specific heat. The transition temperature T$_c$ can be tuned by varying the concentration of Ge or Sn.
Here we use Temperature- dependent Xray diffraction (XRD), Transport measurements and Extended Xray Absorption Fine Structure (EXAFS) measurements to understand the ferroelectric phase transition and local structure during the same for ferroelectric epitaxial layers grown using Molecular Beam Epitaxy (MBE).
References
- Holý, V., Pietsch, U., and Baumbach, T. High-Resolution X-Ray Scattering From Thin Films and Multilayers. Springer Tracts in Modern Physics. 2004; DOI:10.1007/978-1-4757-4050-9
- Suski T. Low-temperature carrier scattering anomalies in ferroelectric Pb$_{1-x}$Ge$_x$Te. Journal of Physics C: Solid State Physics. 1984;17: L689-L696. DOI: 10.1088/0022-3719/17/26/006
- Katayama S, Murase K. Role of local displacement of Ge ions on structural instability in Pb$_{1-x}$Ge$_x$Te. Solid State Communications. 1980; 36:707-711. DOI: 10.1016/0038-1098(80) 90214-8
Primary authors
Lakshmi Sajeev
(Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno)
Dr
Ondřej Caha
(Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno)
Co-authors
Ms
Tetiana Zakusylo
(Institut für Halbleiter-und Festkörperphysik, Johannes Kepler Universität, Linz, Austria)
Prof.
Gunther Springholz
(Institut für Halbleiter-und Festkörperphysik, Johannes Kepler Universität, Linz, Austria)
Dr
Petr Mikulik
(Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Brno)
