Ferroelectric two-level system and phase transition temperature monitoring of SrTiO3 using dielectric resonance modes
M.A. Hosain , Jean-Michel Le Floch , J.F. Bourhill , Jerzy Krupka , Michael E. Tobar
AbstractExperimental monitoring of SrT iO3 single crystal lattice asymmetry and ferroelectric phase transitions using microwave Whispering Gallery (WG) mode is described on the basis of Landau’s theory. The quasi-harmonic phonon approximation is considered in the ferroelectric asymmetry. The measured ferroelectric phase transition temperature is close to 51 K. This incipient ferroelectric phase transition happens initiating a spontaneous polarization (Ps) of the soft-mode forming a double-well potential or two-level system in each crystal unit, and produces dielectric anomaly in macroscopic state increasing imaginary part of relative permittivity. Hence this macroscopic impact allows to monitor different asymmetry of the crystal unit and ferroelectric phase transition in a typical measurements of Q-factor, transmission or frequency shift in cooling down to low temperatures around a few Kelvin. Landau’s theory of correlation length supports these observations as the implication of phonon wave vector qc = 0 of central ion in crystal unit symmetry regarding soft-mode.
|Journal series||arXiv, ISSN 2331-8422|
|Publication size in sheets||0.5|
|Score||= 5.0, 21-05-2020, ArticleFromJournal|
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