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Study of ferroelectric transition of SrTi18O3 single crystal at low temperature by PFM

AuthorsZapata, James ; Catalán, Gustau ; Domingo, Neus
Issue Date2016
PublisherCSIC-ICN Centro de Investigación en Nanociencia y Nanotecnología (CIN2)
CitationFuerzas y Túnel (2016)
AbstractSTO is one of the most widely studied materials in solid state physics and chemistry not only for its subtle and complex phase transitions but also for elucidating and exploring exotic new properties. Itoh et al. showed that substitution of 18O for 16O induces ferroelectricity at temperatures below 24 K. Despite extensive studies, the exact nature of the ferroelectric phase of SrTi18O3 (18STO) is not unambiguously determined and there are also huge difficulties to determine the crystallographic symmetry of the low temperature phase, due to three kinds of nanotwinning: tetragonal ferroelastic nanodomains below 105 K, rhombohedral nanoclusters below 40 K, and orthorhombic nanodomains below Tc =24 K. In the present study, the piezoelectric coefficient d33 of a 18STO single-crystal plate (whose edges were parallel to those of [001] cubic) were investigated at temperatures between 3.5K to 150K by Piezoresponse Force Microscopy (PFM). The experiments were performed using an Attocube AFM (AttoAFM) system controlled by Nanonics electronics. Due to the interferometric detection of cantilever motion in the attoAFM, out-of-plane polarization of piezo-electric domains can be directly obtained with picometer precision, but in-plane piezoelectric signal is only accessible indirectly via crosstalk effects. Experimental d33 coefficient behavior showed two regimes below and above 30K possibly related to the phase transition. No changes around the tetragonal-cubic transition near to 105K were observed.
DescriptionResumen del póster presentado a la 10th Conferencia Fuerzas y Túnel, celebrada en Girona (España) del 5 al 7 de septiembre de 2016.
Appears in Collections:(CIN2) Comunicaciones congresos
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